Sapphire Coarse Cone for reducing the overly thick toe nails and calluses and removing cracks on heels. Can be autoclaved or liquid sanitzed. For use with Medicool's ProTouch 1000, Pro Power 30k, Nail Pro 2000, TurboFile 2400 and PediNova III also: KUPA, ASEPTICO, BRAVO, BUFFALO, NAIL LABO, LASCO, DREMEL, ERICA's. 3/32" shaft.