Countersink drill bit set is quick change compatible and has an adjustable counter sleeve depth with Allen wrench. Countersink drill bit set perfect for wooden planks, plastic, soft metals, fiber board, particle board, plywood, alumiumn board etc. Countersink drill bit set is made by high speed steel and easy to use. Our drill have higher accuracy than the ordinary. The countersink drill bit set have self-starting point and five-fluted design eliminates chatter and vibration for smooth operation to make clean, accurate and burr-free cuts. Color: black gold Size: 12 : drill length 70.6mm, hexagonal shank diameter 6.35mm, drill diameter 3.48mm; 10 : drill length 62.1mm, hexagonal shank diameter 6.35mm, drill diameter 3mm; 8 : drill length 60.3mm, hexagonal shank diameter 6.35mm, drill diameter 2.8mm; 6 : drill length 55.8mm, hexagonal shank diameter 6.35mm, drill diameter 2.35mm; 5 : drill length 47.8mm, hexagonal shank diameter 6.35mm, drill diameter 2mm; Package content: 5pcs woodworking hole saw Warm prompt: 1.As different measuring methods,it will occur 1-3 cm deviation about the items,please ensure that it is okay for you before ordering. 2. Because of different monitors and lamplight, the picture may not reflect the actual color of the item, really thank you for your kind understanding 3. Only the above package contents, excluding other products.