82°countersinks with slow spiral HSS M2 fully ground drills. Used to countersink 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 hold edges and last longer than steel countersinks. Includes replaceable HHS drill bit.