Precision adjustable jig maintains the proper drill bit alignment to ensure the correct location of the rear swivel stud hole. Fits any size stock and automatically self-centers for perfect stud hole alignment. Felt lining prevents marring finished stocks. Includes 5/32' diameter carbon steel drill bit contains a special relief tip to help prevent wood splintering and break-out when drilling. Adjustable drill-depth indicator prevents drilling too deep and ruining the hole. For use with hand-held drill. Perfect for the high volume shop or beginner just starting out. SPECS: Aluminum cylinders, anodized. Steel frame & adjustment bolt, black, matte finish. Includes fixture, 5?32' (3.9mm) dia. drill, and complete instructions.