82° countersinks with slow spiral HSS M2 fully ground drills. Used to countersink and counterbore holes for the heads of screws in wood, plastic and non-ferrous materials. The 2-flute design ensures uniform and concentric results each and every time. Countersink also features an opening to allow for chip evacuation Carbide tips provide chip free hole edges and last longer than steel countersinks. Includes replaceable HHS drill bit.