Premium Quality: Sharp edge, high hardness, precise positioning, high precision, smooth cutting, impact resistance, high toughness. Easy to Use: Allow woodworkers to drill holes without going through the material when a clean and precise bottom to a hole. Suitable for hand-held electric drill, supporting motor-driven drilling machine and moving tape type magnetism drill. door end, drawer tip, plastic products, wood, plywood, etc. Package Included: 1 x 8mm Shank T Slot Router Bit 12.7mm(1/2") for Hex Bolt; 1 x 8mm Shank T Slot Router Bit 9.52mm(3/8") for Hex Bolt plywood, etc The tool can be hardwood, cork, wood and other synthetic wood processing workers smooth surface, but to avoid the processing of copper, iron and other metal materials and sand, stone and other non-wood materials. Allow woodworkers to drill holes without going through the material when a clean and accurate bottom to a hole. The blade more sharp and durable, its head adopts arc curve design, beneficial to chip removal, punching is more efficient. Suitable for hand-held electric drill, supporting motor-driven drilling machine and moving ribbon type magnetism drill. Specification: Body Material: Hardened Steel Blade Material: Carbide Alloy Color: yellow Shank Diameter: 8mm Head Length: Approx. 3/8"(9.52mm) and 1/2"(12.7mm) Overall Length: 46mmContents:8mm Shank T Slot Router Bit For 12.7mm(1/2") Hex Bolt8mm Shank T Slot Router Bit For 9.52mm(3/8") Hex Bolt