BAZHOU ELABORATE DESIGN:Countersink drill bit set is quick change compatible and has an adjustable counter sleeve depth with Allen wrench. MULTIPURPOSE:Countersink drill bit set perfect for wooden planks, plastic, soft metals, fiber board, particle board, plywood, alumiumn board etc. GOOD PERFORMANCE: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. Delivery Quantity: 1set of 7 pcs, tri-point woodworking countersunk drill Package Contents: Only the above package contents, excluding other products. Size: blade diameter: 14-16mm, shank diameter: 3-10mm, the diameter of the chamfer is 15.8mm (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Color: black silver (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)