Rounded head protects cuticles, 3/32 shank will fit any podiatry drill machine | For reducing calluses and cracks on heels, and gently removing rough skin from the foot | NON ABRASIVE, NON PAINFUL. Fine cone for smoothing top of nails, perfect for filing | Comes in an acrylic drill bit holder that is anti-dust. Can be autoclaved or liquid sanitized | Professional pedicure bit for callus and chiropody treatment