Easy to use, carbon steel drill bits contain a special relief tip to help prevent wood splintering and break-out when drilling sling stud holes. Features a built-in counter-sink for precise inletting of the stud spacer and a flush fit every time. Pre-set, drill-depth indicator prevents drilling too deep and ruining the hole. Includes two drill bits, 5/32' dia. and 3/16' dia., for both front and rear stud holes. SPECS: Steel, black, finish. Drills - 5?32' (3.9mm) dia. & 3?16' (4.6mm) dia.