Ceramic nail drill bit: superior material, safety and no heat burn; easy to be cleaned by water and disinfected by alcohol; rust-proof Effective nail drill bit: not need much pressure, takes the acrylic nails down in seconds; stable and no skip, be ???the refined filing??? Professional nail drill bit kit: 7pcs, including 1 coarse nail bit (green makr), 3 medium grit nail bits (blue mark), 2 fine grit nail bits (red mark), 1 dust brush; comes with case for storage Removing Acrylic nails: use different nail bits to trim and remove the side of cuticle, polish and grind, smoothen your gel nails or acrylic nails Nail drill bit for electric nail files: Replacement 3/32 Inches size for most electric nail files machine, manicure and pedicure salon accessories for nail beauty and care