Ceramic drill bit very hard (black)

Description

The ceramic drill bits are ideal for:

Semi-permanent removal
Gel removal
Acrylic removal
To shape the nail
To smooth acrylic or gel

What changes is how rough the surface is.
The rougher their surface, the more material they remove.

The classification in relation to roughness is:
Red: a little rough
Blue: moderately rough
Green: very rough
Black: too rough.