Use for refining the nail edges / shaping the edges / surface of acrylic nail and gel nail.removing excess glue and material from the underside of acrylic / gel nail.Fits all standard 3/32"(2.35mm) Electric Drill File Nail Machines. Feature: - 30pcs Professional Nail Drill Bits- Brand new in retail package- Box size: app 142 * 58 mm- 30pcs nail drill bits with to fit most professional elecric drills- Make hole on your nail to wear jelwery on your nail- Best for replace nail drill bits! Durable replacement! pckage includes: 1 set x 30pcs drill bits + 300pcs sanding bands (#80 #120 #180 each size 100pcs)