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90° COUNTERSINK BIT SET: Suitable for countersunk screws and fixings, 3-piece 90-degree chamfer bits create tapered holes; Ideal for cabinetry, furniture assembly, and woodworking joinery COUNTERSINK BIT SET SIZES: 12 mm, 16 mm, 19 mm; Shank diameter: 6.35 mm (1/4-inch hex shank); Angle: 90 degrees BROAD COMPATIBILITY: Heat-treated carbon steel blades deliver smooth, burr-free chamfers on wooden planks, fiberboard, particle board, plywood, plastic, and even aluminum sheets QUICK-CHANGE HEX SHANK: These countersink drill bit features a standard 1/4-inch (6.35mm) hex shank that is fully compatible with quick-change chuck systems, enabling fast, tool-free bit swaps to keep your workflow efficient Please Note: Please do not use these chamfers on the high hardness metal material