Self Centering Drill Bits HSS Hinge Center Hexagon Drill Bits Door Cabinet Woodworking Positioning Hole Puncher Too Specifications: Materials:Carbon Steel and Aluminum Shank Diameter:1/4 inch Drill Bit Sizing:5/64", 7/64", 9/64", 11/64", 5mm, 13/64", 1/4" Perfect Precision Every Time:Built with a spring-loaded guide that centers the bit every time, giving you a perfectly centered hole without fail. Save time and effort with a professional finished product. Versatile Sizing For Every Job:This 8 piece set comes with 8 different drill bit sizes, guaranteeing you will never be without the right-sized tool for the job(see sizing chart at bottom of the page.) Perfect for cabinet installation, door installation, windows, drawers, and more. Reliable & Durable:Expertly crafted out of aircraft-grade aluminumand carbon steel, these drill bits extremely durable, shockproof, and rustproof. They will keep working long after the job's done. _x000D_ _x000D_