General description This 23-piece woodworking countersink drill bit set is designed for precision and versatility. It includes a variety of bits suitable for countersinking 90-degree holes in wood and soft metal screws and fasteners, making it ideal for DIY projects, home improvement, and general construction applications. Technical specifications 6 x 1/4 inch hex shank HSS 90-degree countersink drill bits 7 x high-speed triangular steel countersink drill bits 8 x 3/8" wood shank router bits 1 x hex L wrench 1 x self-centering punch Router bit sizes: 6mm (1/4 inch), 8mm (5/16 inch), 9mm (3/8 inch), 12mm (1/2 inch), 16mm (5/8 inch), 19mm (3/4 inch) Usage Ideal for countersinking holes in wood panels, fiberboard, particle board, plywood, plastic, aluminum panels, circuit boards, and more. Suitable for use with soft metal screws and fasteners.