Ivy Classic M2 high speed steel countersinks are constructed out of hardened and tempered M2 high speed steel and feature a precision-ground 82-degree point for Countersinking into most machinable metals, wood and plastic. These countersinks are designed with five flutes for chatter free, smooth drilling, chamfering and deburring. They create conical shaped recesses to Seat Flat and oval-head screws and feature a 1/4-inch round shank. Ivy Classic Industries is dedicated to producing a comprehensive, quality line of power tool accessories and hand tools.