All in One Nail Drill Bits Set: With 7pcs different shapes and sizes nail bits you need in one set, it does great jobs for any professional manicurist or beginner, cutting your time in a half. Professional for nail preparation, acrylic nails polishing shortening, nails surface removing, cuticle area dead skin cleaning. Professional Carbide Nail Drill Bits: Comes with 2pcs Fine-grit bits/ 4pcs Medium-grit bits, all are made of optimum strength tungsten carbide material, which is sturdy sharpen enough to remove sharpen smoothen acrylic gel nails, thick extension nails, builder gel nails, natural nails.