Used to Countersink holes for the heads of screws in woods, plastic and non-ferrous materials. The 2-Flute integral design ensures uniform and concentric results each and every time. Carbide tips provide chip free hole edges and lasts much longer than steel countersinks, #55608, (A°) angle: 49°, (B) Cutting Height: 1/2, (D) Diameter: 7/16, (D) shank: 5/16, overall length (L): 3-1/4, wood screw size: 8, Wings: 2, D1: 11/64, replacement drill: 630-272, L1: 1-5/8, 55608 carbide Tipped 82 degree Countersink taper #8 screw 7/16 dia x 11/64 drill DIA x 5/16 round shank