How to Use Nail Drill Bits for Perfect Manicures

If you’ve ever felt overwhelmed trying to figure out different nail drill bits and their uses, you’re not alone. From flame bits to carbide bits to sanding bands, there are a lot of options — and knowing which bit to use can make a huge difference in both your results and your client’s comfort.

In professional nail settings, these tools are more commonly used with an e-file, or electric file, so you’ll often hear nail techs refer to them as “e-file bits” rather than “nail drill bits.” But because “nail drill bits” is the term many people search for online, we’ll use both throughout the beginning of this article.

The truth is, there’s no single “best” nail drill bit for every service. Different bit shapes, materials, and grit levels are designed for different tasks, whether you’re removing gel polish, refining acrylic or builder gel, prepping soft gel extensions, performing pedicure services, or finishing a dry manicure. Understanding nail drill bits and what they are used for can help you work more efficiently while also reducing heat, friction, and accidental overfiling.

And despite what social media sometimes suggests, safer e-file manicures are not about using the most aggressive bit possible. In most cases, great technique, proper angles, and choosing the right bit shape matter far more than speed or force.

In this guide, we’ll break down:

• Different nail drill bits and their uses
• Which nail drill bit to use for cuticles
• How to use a nail drill on gel nails
• Common beginner mistakes to avoid
• Tips for getting cleaner, smoother manicure results with an e-file

TL;DR: Quick Takeaways

• Different nail drill bits are designed for different tasks.
• Diamond bits are commonly used for cuticle and skin work.
• Carbide bits are typically used for product removal and refinement.
• Fine grit bits are often easier for beginners to control.
• The angle of the bit matters just as much as the bit itself.
• Let the bit do the work — pressure usually creates more problems, not better results.

Understanding Nail Drill Bits and Their Uses

Before we dive into the different types of bits, it’s worth clarifying one piece of terminology. While many people search for “nail drill bits,” professional nail techs more commonly refer to these tools as e-files and e-file bits.

Many nail techs prefer this terminology because the word “drill” can sound intimidating to clients and doesn’t accurately describe how these tools are used during professional services. E-file work is typically focused on controlled exfoliation, refinement, surface smoothing, and product removal — not “drilling” into the nail.

From this point forward, we’ll primarily refer to them as e-file bits throughout the rest of this guide.

Understanding e-file bits and their uses starts with knowing that different bits are designed for different parts of the manicure, enhancement, or pedicure process. No single bit is meant to do everything, which is why professional nail techs often switch between multiple bits during a service.

The material, shape, size, and grit of a bit all affect how it performs. Some bits are designed to safely exfoliate non-living skin around the cuticle area, while others are made specifically for removing gel, acrylic, builder product, polygel, or other enhancement products. Using the wrong bit for the task can make services feel rougher, less precise, and more difficult than they need to be.

One of the biggest misconceptions beginners have about e-file bits is assuming that more aggressive always means more effective. In reality, choosing the correct shape and grit usually matters far more than choosing the coarsest bit possible.

Here are some of the most common categories of e-file bits and what they are used for:

Bit Type	Common Uses	Typically Used On
Diamond Bits	Cuticle work, prep, exfoliating non-living tissue	Natural nails and surrounding skin
Carbide Bits	Removing gel, acrylic, builder product, or enhancement bulk	Enhancement product; specialty pedicure use when designed for it
Sanding Bands	Surface prep and refinement	Natural nails or product, depending on grit
Polishing Bits	Finishing and smoothing	Natural nails, skin, or finished enhancements depending on the bit

The shape of the bit also matters. For example, a flame-shaped bit is designed for precision around the cuticle area and sidewalls, while barrel bits offer more surface contact and control for general prep work, surface refinement, or product smoothing. Carbide bits often have cutting flutes designed for efficient material removal. In manicure services, they’re most commonly used to remove gel, acrylic, or builder product rather than for skin work.

However, there are specialty carbide bits designed specifically for pedicure services, including reducing thick callus buildup or working around corns. These bits require proper training and should only be used for their intended purpose.

Grit is another important factor when choosing which e-file bit to use. Just like a hand file, e-file bits come in different grit levels ranging from fine to coarse. Finer grits are typically smoother and more beginner-friendly, while coarser grits remove material more aggressively.

As you become more comfortable using an e-file, you’ll start to notice that the best manicure results usually come from pairing the right bit shape with the right technique — not from trying to force one bit to do every job.

Different E-File Bits and Their Uses

There are many types of e-file bits, and each is designed for a different function depending on the shape, material, grit, and service being performed. Understanding what each bit is designed to do can help you work more efficiently while creating cleaner, more refined manicure results.

While every nail tech develops personal preferences over time, most professional e-file bits fall into a few common categories.

Flame Bits

Flame bits are one of the most popular bit shapes for dry manicure prep and cuticle work. Their pointed tip and curved body make them especially useful for reaching tight areas around the cuticle and sidewalls.

They are commonly used for:

• Exfoliating non-living tissue around the cuticle area
• Cleaning tight sidewalls
• Lifting and separating cuticle tissue during prep
• Precision work in smaller areas

Because flame bits have a pointed tip, angle control is important. The tip should glide along the area you’re working on rather than being pushed directly into the nail plate or skin.

Barrel Bits

Barrel bits come in a variety of shapes and sizes, including straight-body and tapered-body styles with either a flat or rounded top. Their larger working surface makes them popular for both manicure prep and product refinement, depending on the material and grit of the bit.

They are commonly used for:

• General manicure prep
• Cuticle exfoliation
• Sidewall cleanup
• Refining the nail surface
• Smoothing gel or acrylic
• Dry manicure services

Barrel bits also come in a range of sizes. Larger barrel bits are typically designed for broader surface work, like smoothing product, refining structure, or prepping larger areas of the nail plate. Smaller barrel bits offer more precision and visibility, which makes them popular for detailed cuticle work and tighter areas around the sidewalls.

Straight-body barrel bits provide a larger, flatter contact area, while tapered-body barrel bits can offer additional visibility and maneuverability around curves and sidewalls.

The top of the bit also affects how it functions. Flat-top barrel bits have a defined edge, which can make them useful for carefully carving away overgrown cuticle tissue and creating crisp, controlled exfoliation. Rounded-top barrel bits offer a softer point of contact and are often preferred for gently pushing cuticle tissue back from the nail plate.

Rounded-top styles can be especially helpful for sensitive clients or clients whose skin is not a good candidate for aggressive cuticle work. In many cases, gently exfoliating and lifting tissue creates healthier, more comfortable results than trying to aggressively work underneath the cuticle to create a deep “cuticle pocket.”

Unlike bits with a pointed tip or rounded belly, barrel bits are often designed to sit flatter against the nail plate. This broader contact area can help create smooth, even refinement when paired with proper pressure and technique.

Ball Bits

Ball bits are typically used after exfoliation to help remove lifted non-living tissue around the cuticle area.

They are commonly used for:

• Smoothing exfoliated skin
• Removing loosened dead tissue
• Refining the cuticle area after prep
• Finishing dry manicure services

The size of the ball bit affects how much surface area it covers, so many nail techs keep multiple sizes available depending on the client and service.

Carbide Bits

Carbide bits are designed for efficient product removal and refinement. Unlike diamond bits, which are commonly used for skin and prep work, carbide bits use cutting flutes to quickly remove material.

They are commonly used for:

• Removing gel polish
• Debulking builder gel
• Refining acrylic enhancements
• Shortening enhancement length
• Smoothing enhancement surfaces

In manicure services, carbide bits are generally intended for product — not living skin. Specialty carbide bits for pedicure callus work do exist, but they are designed specifically for those services and require proper training.

Sanding Bands

Sanding bands are disposable abrasive bands that slide onto a mandrel bit. They’re commonly used because they’re inexpensive and easy to replace between clients.

They are commonly used for:

• Surface prep
• Refining product
• Shortening length
• Smoothing enhancement surfaces
• Light natural nail prep, with appropriate grit

Because sanding bands have a broad abrasive surface, pressure control is important. Coarse sanding bands can remove material quickly, so many beginners find fine or medium grits easier to control.

Looking for professional-quality bits for cuticle work, gel removal, and manicure prep? Shop Erica’s ATA’s professional e-file bit kits here.

Which E-File Bit Should You Use for Cuticles?

One of the most common questions beginners ask is which nail drill bit to use for cuticles. The answer depends on both the client’s skin and the type of manicure service you’re performing, but in most cases, diamond bits are the preferred choice for cuticle work because they’re designed for controlled exfoliation of non-living tissue.

Different bit shapes create different results. Some are designed for precision and tight sidewall work, while others offer broader surface contact for smoother, gentler exfoliation.

Here are a few of the most commonly used cuticle bit styles:

Flame Bits for Precision Cuticle Work

Flame bits are popular because their pointed tip allows nail techs to reach tight areas around the cuticle and sidewalls with a high level of precision.

They’re commonly used for:

• Lifting cuticle tissue from the nail plate
• Cleaning sidewalls
• Detailed dry manicure prep
• Working in smaller or tighter nail folds

Because flame bits have a pointed tip, angle control is extremely important. The tip should glide alongside the area being exfoliated rather than being pushed downward into the nail plate.

Barrel Bits for Controlled Exfoliation

Smaller barrel bits are commonly used for broader cuticle exfoliation and prep work. Many nail techs find them easier to control because the working surface is flatter and more stable than a pointed bit.

Rounded-top barrel bits can be especially helpful for:

• Sensitive clients
• Thin or delicate skin
• Clients prone to irritation
• Gently pushing tissue back from the nail plate

Flat-top barrel bits may offer more defined exfoliation and precision when removing heavier overgrown tissue.

Ball Bits for Finishing

Ball bits are typically used after exfoliation to remove loosened non-living tissue and refine the cuticle area.

They’re often used to:

• Smooth lifted tissue
• Refine dry manicure results
• Create a cleaner finished appearance

The size of the ball bit affects how aggressively it exfoliates, so many nail techs adjust the size based on the client’s skin and sensitivity level.

Fine Grit Is Usually Best for Beginners

When learning how to use e-file bits for cuticle work, many beginners assume they need a more aggressive bit to get cleaner results. In reality, finer grit bits are often easier to control and can still create beautiful prep work when paired with proper technique.

A more refined, consistent approach is usually safer and more comfortable for the client than aggressive pressure or excessive exfoliation.

It’s also important to remember that not every client is a good candidate for deep cuticle work or aggressive “cuticle pocket” techniques. Healthy, comfortable skin should always take priority over creating an overly edited or dramatic look.

How to Use a Nail Drill on Gel Nails

While gel polish is one of the most common services people associate with nail drill bits, e-files are also widely used with acrylic, builder gel, hard gel, soft gel extensions, polygel, and even certain pedicure services. The safest and most efficient services usually involve switching between different bits depending on whether you’re prepping the nail, removing product, refining structure, or smoothing the finished enhancement.

Different products also require different approaches. Soft gel polish, structured gel manicures, acrylic overlays, builder gel, and soft gel extensions may all require different bit shapes, grit levels, and RPM settings.

Removing Gel Polish and Enhancements

Carbide bits are commonly used for removing gel polish, reducing bulk product, and refining enhancements because they can remove material efficiently without requiring excessive pressure.

Depending on the service, they may be used for:

• Removing gel polish
• Refining builder gel or hard gel
• Debulking acrylic
• Shortening enhancements
• Smoothing soft gel extension or polygel structure
• Rebalancing enhancement services

When removing product:

• Keep the bit moving continuously
• Use light pressure and let the bit do the work
• Avoid pressing down to “force” removal
• Work in smooth, controlled passes
• Leave a thin layer of product behind rather than aggressively filing directly onto the natural nail whenever appropriate for the service

Trying to completely remove every trace of enhancement product can increase the risk of overfiling and unnecessary nail plate damage.

Refining Structure and Surface Shape

After acrylic, builder gel, hard gel, or soft gel extensions are applied, barrel bits are often used to refine the surface and smooth the structure of the nail.

These bits can help:

• Smooth uneven areas
• Refine apex structure
• Blend bulky product
• Perfect surface shape before top coat
• Refine the underside of extensions
• Prepare enhancements for fills or rebalancing

Straight-body barrel bits are especially useful for creating smooth, even refinement because they are designed to sit flatter against the nail surface.

Prepping Nails Before Product Application

Before gel, acrylic, or enhancement application, diamond bits are commonly used during dry manicure prep to exfoliate non-living tissue from the cuticle area and sidewalls.

Proper prep can help:

• Improve product adhesion
• Create cleaner polish application
• Reduce lifting around the cuticle area
• Improve the finished appearance of the manicure
• Help enhancements grow out more cleanly

The goal of prep is not to aggressively remove skin, but to gently exfoliate tissue that would interfere with product application.

Using E-File Bits During Pedicures

E-file bits can also be used during pedicure services for nail prep, cuticle work, smoothing thickened toenails, and reducing callused skin.

Different pedicure services may use:

• Diamond bits for cuticle and nail prep
• Carbide bits for thickened nails or specialty callus work
• Sanding bands for surface smoothing
• Specialty pedicure bits designed for broader areas of skin

As with manicure services, choosing the correct bit and using proper pressure matters more than aggressive filing.

Avoiding Heat and Friction

One of the most common beginner mistakes when using e-file bits on gel nails and enhancements is creating heat spikes from excess friction.

Heat is usually caused by:

• Too much pressure
• Holding the bit still
• Incorrect RPM settings
• Using a dull bit
• Improper bit angle

If a client feels heat, discomfort, or burning, it’s a sign that something in the technique needs to be adjusted.

In most cases, refined technique and proper bit selection create better results than aggressive pressure or speed.

Should I Use My Nail Drill in Forward or Reverse?

One of the most common questions beginners ask is whether they should use their e-file in forward or reverse. The short answer is: professional nail techs typically use both.

The easiest way to think about it is this:

In most cases, the bit should rotate against the direction you’re moving your hand.

For example:

• If you’re moving the bit from left to right, you’ll typically use forward.
• If you’re moving from right to left, you’ll typically use reverse.

This helps the bit cut smoothly instead of skipping, bouncing, or feeling rough against the nail.

How Hand Dominance Affects Direction

Hand dominance also affects which direction feels most natural.

For many right-handed nail techs:

• Forward feels more natural when working top-to-bottom
• Reverse is often used when switching sides of the nail or changing movement direction

For many left-handed nail techs:

• Reverse becomes the primary direction for many carbide bit services, especially product removal

The goal is not to memorize one universal setting. The goal is to position yourself so the bit rotates against your movement path in a smooth, controlled way.

Why Direction Matters

Most carbide bits have directional cutting flutes designed to remove product efficiently in a specific rotation. If the bit is spinning in the wrong direction for your movement, it can feel:

• Rough
• Bouncy
• Chattery
• Less controlled

Direction changes also help maintain cleaner ergonomics and better visibility during cuticle work, especially around sidewalls.

Reverse Is Not “Wrong”

Many beginners avoid reverse because it initially feels unfamiliar, but reverse is a completely normal part of professional e-file use.

In fact, many left-handed nail techs use reverse as their primary direction during acrylic, builder gel, hard gel, or gel polish removal services.

Learning to comfortably switch between forward and reverse helps create:

• Smoother product removal
• Better cuticle control
• Cleaner sidewall work
• More balanced movement across both hands

The more important focus is precise technique, proper bit angle, and consistent movement — not staying in one direction the entire service.

Common E-File Bit Mistakes Beginners Make

Learning how to use e-file bits takes practice, and most beginners make similar mistakes when they first start working with an e-file. In many cases, the issue is not that the nail tech is using an e-file at all — it’s that the wrong bit, angle, pressure, or technique is being used for the service.

Understanding different e-file bits and their uses can help make services feel smoother, safer, and more controlled for both the nail tech and the client.

Choosing the Wrong Bit Shape

Different bit shapes are designed for different functions. Trying to use the same bit for every service often makes e-file work harder, less efficient, and less controlled.

For example:

• Flame bits are designed for precision cuticle and sidewall work.
• Barrel bits are designed for broader surface contact and refinement.
• Ball bits are designed for finishing and smoothing exfoliated tissue.
• Carbide bits are designed primarily for product removal and refinement.

Choosing a bit shape that matches the service usually creates cleaner results with less effort and pressure.

Holding the Bit at the Wrong Angle

Every bit shape is designed to contact the nail or skin differently.

• If a bit has a pointed tip, avoid driving that point into the nail plate or surrounding skin.
• If a bit has a rounded belly, laying the belly flat against the nail plate can create uneven pressure or accidental digging.
• Barrel bits are designed differently and are often intended to sit flatter against the nail surface during refinement.

The goal is to use the intended working surface of the bit rather than forcing the edge, tip, or widest part into the nail.

Trying to Use One Bit for Everything

One of the biggest beginner mistakes is trying to perform every step of the service with a single bit.

Different bits are designed for:

• Prep
• Product removal
• Refining structure
• Surface smoothing
• Cuticle exfoliation
• Pedicure callus work
• Finishing and detailing

Switching bits throughout a service is normal and often creates safer, more efficient results.

Choosing the Wrong Grit

Different grit levels are designed for different services, products, and stages of the manicure or pedicure process. Using the wrong grit can make services feel slower, rougher, or less effective.

Many beginners go too coarse too quickly, assuming a more aggressive grit will make product removal or prep easier. In reality, coarse grits can be harder to control and may increase the risk of overfiling if technique is inconsistent.

But going too fine can also create problems.

For example:

• Extra-fine diamond bits are often designed for finishing and refining rather than heavy exfoliation.
• Using a grit that is too fine during prep may not properly remove non-living tissue that could interfere with product adhesion.
• In pedicure services, a grit that is too fine may not effectively smooth thickened skin or callus buildup.

Carbide bits also come in different grit levels and cut styles depending on the service being performed. Different carbide grits may be used for:

• Removing gel polish
• Refining builder gel or hard gel
• Debulking acrylic
• Smoothing enhancement surfaces
• Rebalancing fills
• Finishing enhancement services

Carbide bits are also cut differently depending on handedness. Right-handed and left-handed carbide bits are designed to cut smoothly in opposite directions, so left-handed nail techs should look for left-handed carbide bits designed for reverse rotation.

The best grit depends on the service, product type, area being worked on, and the nail tech’s experience level. In most cases, choosing the correct grit creates better results than simply choosing the most aggressive option available.

Using Too Much Pressure

One of the most common e-file mistakes is trying to “push” the bit into the nail or product.

In most cases:

• Pressure increases heat and friction
• Excess force reduces control
• The bit becomes less efficient, not more efficient

A properly matched bit with the correct RPM should do most of the work with relatively light pressure.

Holding the Bit Still

Keeping the bit stationary in one area can quickly create heat buildup and uneven filing.

Instead:

• Keep the bit moving continuously
• Work in smooth passes
• Avoid pausing in one spot
• Let the shape of the bit glide across the surface naturally

This is especially important during gel polish, acrylic, hard gel, and builder gel removal services.

Using the Wrong RPM

Using RPM settings that are too low can sometimes cause the bit to catch or skip, while excessively high speeds may reduce control for beginners.

The ideal RPM depends on:

• The service
• The bit type
• The grit
• Your experience level
• Whether you’re working on natural nails, enhancements, or pedicure services

Many nail techs find that consistent technique matters more than simply increasing speed.

Using Product Removal Bits on Living Skin

Carbide bits designed for enhancement removal should generally not be used on living skin during manicure services.

Product-removal bits are designed for:

• Acrylic
• Builder gel
• Hard gel
• Gel polish
• Polygel
• Enhancement refinement

Cuticle work and skin exfoliation are typically performed with finer diamond bits designed specifically for those areas.

Pro Tips for Safer, Cleaner E-File Manicures

Good e-file work is usually the result of small technique adjustments rather than aggressive filing or expensive tools. Even experienced nail techs constantly refine their hand positioning, pressure, angles, and bit selection to create smoother, cleaner results.

Whether you’re working on natural nails, acrylic, builder gel, soft gel extensions, hard gel, polygel, or pedicure services, these habits can help improve both safety and control.

Stabilize the Finger You’re Working On

One of the easiest ways to improve e-file control is stabilizing the client’s finger before the bit touches the nail.

Proper stabilization can help:

• Reduce slipping
• Improve precision
• Maintain consistent bit angles
• Create smoother exfoliation and refinement

Many beginners try to work too quickly without anchoring their hands, which often creates inconsistent pressure and uneven movement.

Let the Bit Do the Work

If you feel like you have to push hard, the problem is usually:

• The wrong bit
• The wrong grit
• Incorrect RPM
• A dull bit
• Improper technique

Excess pressure typically creates:

• Heat spikes
• Friction
• Reduced control
• Client discomfort

A properly matched bit should remove product or exfoliate tissue efficiently with relatively light pressure.

Watch Your Bit Angle

Different bit shapes are designed to contact the nail differently.

For example:

• Flame bits require careful angle control to avoid pushing the tip into the nail plate.
• Barrel bits are often intended to sit flatter against the nail surface.
• Rounded-top bits may create softer cuticle exfoliation for sensitive clients.

Understanding how each shape is intended to contact the nail usually creates smoother, safer results.

Keep the Bit Moving

Holding the bit still in one place can quickly create heat and uneven filing.

Instead:

• Use smooth, controlled passes
• Glide across the surface
• Avoid pausing in one spot
• Maintain steady movement during product removal and refinement

This is especially important when working with acrylic, hard gel, builder gel, or thicker enhancement products.

Match the Bit to the Service

Professional nail techs rarely use the same bit for every step of a service.

Different bits may be needed for:

• Cuticle prep
• Product removal
• Refining structure
• Surface smoothing
• Finishing work
• Pedicure callus reduction

Using the correct bit often makes the service feel easier, more efficient, and more controlled.

Practice Before Working Quickly

Many beginners focus on speed too early. In reality, smoothness and consistency matter far more than working fast.

Practicing:

• Hand positioning
• Direction changes
• Pressure control
• RPM adjustments
• Bit angles

usually improves results much faster than simply increasing speed.

Final Thoughts on Using E-File Bits

Learning how to use nail drill bits safely and effectively takes time, practice, and the right technique. While different nail drill bits and their uses can feel overwhelming at first, understanding how bit shape, grit, angle, and pressure work together makes e-file services much easier to control.

In professional nail settings, these tools are more commonly referred to as e-files and e-file bits, which more accurately reflects how they’re used during professional services.

The most important thing to remember is that cleaner manicure results do not come from using the most aggressive bit possible. In most cases, smoother technique, proper bit selection, and controlled movement create better results than excess speed or pressure.

As you gain experience, you’ll start to recognize which bits work best for different services, whether you’re performing dry manicures, refining acrylic, smoothing builder gel, prepping soft gel extensions, removing gel polish, or performing pedicure services.

Professional e-file work is less about “drilling” and more about controlled exfoliation, refinement, and product removal.

Choosing high-quality bits designed for the specific service you’re performing can help improve:

• Client comfort
• Product adhesion
• Service efficiency
• Surface smoothness
• Cuticle refinement
• Overall control during e-file work

Whether you’re just learning how to use nail drill bits or refining advanced e-file techniques, focusing on proper bit selection and controlled technique will always create safer, more consistent results over time.

Ready to upgrade your e-file setup? Shop Erica’s ATA’s collection of professional nail bits, manicure tools, and e-file accessories here.

Frequently Asked Questions

What do different nail drill bits do?

Different e-file bits are designed for different parts of manicure, enhancement, and pedicure services. Diamond bits are commonly used for cuticle prep and exfoliation, carbide bits are typically used for product removal and refinement, ball bits help smooth exfoliated tissue, and sanding bands are often used for surface prep and shaping.

Which nail drill bit is best for beginners?

Many beginners find fine or medium grit diamond bits and barrel bits easier to control because they create smoother contact with the nail and skin. Starting with less aggressive grit levels often helps new nail techs focus on pressure, angle, and control before moving into more advanced techniques.

Can you use carbide bits on natural nails?

In most cases, carbide bits should not be used directly on the natural nail plate unless the bit was specifically designed and labeled for that purpose. Carbide bits are most commonly intended for removing or refining acrylic, builder gel, hard gel, soft gel extensions, and other enhancement products rather than filing the natural nail itself.

If a carbide bit is approved for natural nail use, it should still be used with the correct grit, pressure, RPM, and technique to avoid overfiling or heat buildup.

What RPM should I use for cuticle work?

The ideal RPM for cuticle work depends on the bit, technique, and experience level of the nail tech. In general, cuticle prep is typically performed at lower speeds than enhancement removal services because the focus is controlled exfoliation rather than rapid product removal.

Why does my e-file feel hot?

Heat is usually caused by excess friction. Common causes include too much pressure, holding the bit still, improper bit angle, dull bits, incorrect RPM settings, or using the wrong bit for the service. In most cases, smoother technique and lighter pressure reduce heat significantly.

Why do professionals say e-file instead of nail drill?

Many professional nail techs prefer the term “e-file” because “nail drill” can sound intimidating to clients and doesn’t accurately describe how the tool is used. Professional e-file services are focused on controlled exfoliation, refinement, surface smoothing, and product removal rather than “drilling” into the nail.