Description: Slotted taper for chatter-free deburring and countersinking. made from steel, surface titanium coated and has a long wear life. 90° chamfer, smooth and burr-free. Through slot chip removal prevents chips from clogging in workpiece. gives best results at low cutting speeds in steel, wood and plastic and light metals. This 4 piece countersink and deburring tool set is perfect for cutting through metal, wood and plastic quickly and easily. Note: The chamfering device needs to cooperate with the bench drill operation, do not use a hand electric drill to operate! Continuous cooling should be carried out during the application process. Specification: Material: Steel Size Chart: 2-5: Shank 6mm, R 10mm, L 45mm, Hole Range 2-5mm 5-10: Shank 8mm, R 14mm, L 49mm, Hole Range 5-10mm 10-15: Shank 10mm, R 21mm, L 66mm, Hole Range 10-15mm 15-20: Shank 12mm R 28.5mm, L 84mm, Hole Range 15-20mm Package Includes: 4 Pieces HSS Chamfer Cutter Bit Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!