1. Insert the bit fully into the handpiece and lock it; run it briefly at low speed to check it spins true.
2. Support the client's finger and angle the bit beneath the free edge.
3. Coarse grit removes product fast, so keep speed moderate and pressure light until you are confident with the bit.
4. Angle the slim tip beneath the free edge and sweep lightly to clean away debris and excess product.
5. Sweep lightly along the underside, keeping the bit moving and away from the hyponychium.
6. Check the free edge from the side to make sure the thickness is even.
7. After the service, brush away debris, clean and disinfect the bit according to your local regulations, and dry it fully before storing.

• Using the bit on the nail surface: This slim bit is designed for the underside; use a barrel for shaping the surface.
• Finishing with the coarse grit: Coarse leaves visible scratches; always follow with a medium or fine bit before colour or top coat.
• Touching the hyponychium: Contact beneath the free edge can be painful; work only on product and debris under the nail.
• Over-thinning the free edge: Removing too much weakens the tip; check thickness from the side as you work.
• Pressing too hard: Pressure creates heat and uneven results; use light, sweeping contact.

• Bit type: Under nail cleaner
• Grit: Coarse
• Material: Carbide
• Shank size: 3/32" (fits most professional nail drills)
• Finish options: Galaxy, Yellow Titanium
• Best for: Under-nail cleaning, underside shaping and stubborn buildup removal
• Care: Brush, clean and disinfect between clients; dry fully before storing
• Use: Professional nail services

Why use a coarse under nail cleaner?

Coarse grit removes stubborn buildup and excess product beneath the free edge quickly. Follow with a finer bit if the underside needs a smoother finish.

Is coarse grit too aggressive for a regular fill?

For a routine fill with little growth, coarse can remove more than you need; it is best for heavy grow-out, shortening or full product reduction. Many technicians debulk with coarse, then switch to medium or fine to refine the shape.

How do I clean a carbide bit properly?

Remove dust with a cleaning brush, then clean and disinfect according to your local hygiene regulations and dry the bit completely. Moisture left in the flutes can lead to rust and reduce cutting performance.

How do I avoid making the free edge too thin from underneath?

Work in short, light passes and check the nail from the side after each one. Stop once the underside is clean and the edge looks even rather than chasing a very thin tip.

Why is my client uncomfortable when I clean under the nail?

Discomfort usually means the bit is getting too close to the hyponychium or the speed is too high. Lower the speed, change the angle so the bit only touches product, and work more slowly.