About this item Combination Details: 1/8″- 3/4″(3-19mm) Chamfer*1, 1/4″- 1″(5-25mm) Chamfer*1. Material: High hardness tungsten steel material, black surface treatment, ruggedness, not easy to corrode and rust. Design: 5-25mm chamfers are designed with a chip evacuation port for smooth and efficient chip removal during use, ensuring a cleaner and more accurate chamfering process. Easy to use: quick-connect drill with hexagonal shank, burr removal with gentle pressure at low speeds. Wide range of applications: for 3-25mm rounds, rods, threaded rods, screws, bolts, etc. for a wide range of materials including copper, aluminium, stainless steel, wood, plastic, fibreglass and even hardened steel.