Premium Quality: Sharp edge, high hardness, precise positioning, high precision, even cutting, impact resistance, high toughness. Easy to Use: Allow carpenters to drill holes without passing through the material when a clean and precise to one hole.Suitable for hand-held electric drill, supporting motor-driven drilling machine and movable ribbon type magnetism drill.Usage: Used for wood perforation, spherical butt installation door, drawer tip, plastic products, wood, plywood, etc.Package Included: 1 x 8mm Shank T Slot Router Bit 12.7mm(1/2") for hex bolt; 1x 8mm Shank T Slot Router Bit 9.52mm(3/8") for hex bolt Feature: Used for wood punching, spherical door tip installation, drawer tip, plastic products, wood, 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 materials non-wood. Allow carpenters to drill holes without going through the material when a clean and precise bottom to a hole. The blade more sharp and durable, its head adopts arc curve design, beneficial for chip removal, punching is more efficient. Suitable for hand-held electric drill, supporting motor-driven drilling machine and movable ribbon type magnetism drill.Specification: Body Material: Hardened SteelBlade Material: Carbide Alloy Color: Yellow Shank Diameter :8mm Head Length: Approx. 3/8"(9.52mm) and 1/2"(12.7mm) Total Length: 46mm Contents: 8mm Tail T Slot Router Bit For 12.7mm(1/2") Hex Bolt 8mm Shank T Slot Router Bit For 9.52mm(3/ 8") Hex Bolt