- Item Name: Diamond Nail Bit - Material: diamond - Head Size: C:7.5 mm, M:7.1 mm, F:6.8 mm - Grit:Green/Coarse, Blue/Medium,Red/Fine - Usage: Nail Drill, Manicures, Nail polishing, Nail File, Nail Art Salon, Foot Care, Pedicure, Electric Manicure Drill, Cuticle Clean, Fit most nail machine that use 3/32&x27;&x27; rotary burrs, ideal manicure and pedicure tool Suitable for professional nail artists and the beginner or home use