High grade carbon steel. Tri-point cutters and twin side cutters help reduce splintering. ¼"" hex power drive shank. Hexagon shank prevents slipping in 3-jaw chucks. Features: -- Overall Length: 152mm -- High Grade Carbon Steel -- Tri-point Cutters and Twin Side Cutters -- ¼"" Hex Power Drive Quick-Change Shank -- Fast Drilling in Wood, Chipboard and Plasterboard -- Ideal for Door Locks, Electrical and Plumbing work Specifications: Kit Contents: Sizes: 10, 12, 16, 18, 20 and 25mm Product Contents: Sizes: 10, 12, 16, 18, 20 and 25mm Country of Origin: China