For filing and shaping the free edge of nail and backfills. Shape and create the perfect "C' curve. Use on acrylic, gel, fiberglass and silk. For use with Medicool's ProTouch 1000, Pro Power 30k, Nail Pro 2000, TurboFile 2400, PediNova III and also: KUPA, ASEPTICO, BRAVO, BUFFALO, NAIL LABO, LASCO, DREMEL, ERICA's. 3/32" shaft.