.2-Flute - 118° Cam Relieved Pilot Point - 2305 Center Drill, TIALN, RH Spiral, Cam Relieved, 3/64 The 2305 Center Drill is available in 60°, 82°, and 90° angle points and is stocked uncoated and with TiAlN coating. The 2305 Center Drill is a 2-flute, general purpose drill designed to be a combination drill and countersink, centering and chamfering in one single operation.