1、WEAR RESISTANT AND DURABLE: Suitable for using with electric drills, wear resistant and durable, not hurting hands 2、HIGH STRENGTH: Made of good quality carbide material possess high strength, can be polished with or without threads 3、FOR VARIOUS MATERIALS: Suitable for removing materials such as stainless steel, hardened steel, mild steel, copper, brass, aluminum, glass fiber, wood, plastic, etc. 4、QUICK CHAMFERING WITHOUT BURRS: Deburring external drill come with quick chamfering, smooth and clean without burrs 5、ENOUGH TO REPLACE: A total of 4pcs of deburring external chamfering tool, enough for you to replace and use, useful and practical 4 x Deburring External Chamfering Tool Item Type: Deburring External Chamfering ToolMaterial: Hard alloyChamfer Diameter: Inner Diameter: Approx. 21mm / 0.83in, Outer Diameter: Approx. 29mm / 1.14inTotal Length: Approx. 50mm / 1.97in(manual measurement of parameters, with certain error)