Medium Grit DIAMOND Bit. Used for prepping the nail, shaping around the cuticle area and cleaning under the nail. Use for acrylic, silk, gel and fiberglass. 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.