Conical Countersink HSS, round shank For accurate countersinking of drill holes for flush screw connections in wood, metal and plastic. Product advantages High heat resistance for a long service life 90° countersink angle for preparing flush screw connections with flat-head screws Special geometry with 3 cutting edges for smooth running and fast progress Technical data Number of cutting edges: 3 Countersink angle: 90° Shank diameter: 8 mm Shank design: Round shank Direction of rotation: Right-hand Instructions for use When using on metal, always first create a dimple with a center punch or pre-drill the hole and always use cutting oil.