Used for filing and shortening the nail. Shapes and files the "C" curve and cuticle area. Ideal for prepping the nail. Use on acrylic, silk, fiberglass and gel. For use with Medicool's Pro Power 520, Turbo file II, Pro Power 30K, Nail Glide 2100, Pro Power 20K, PediNova III and also: KUPA, ASEPTICO, BRAVO, BUFFALO, NAIL LABO, LASCO, DREMEL, ERICA's. All bits have a 3/32" shaft.