Material: Made of hard metal, high strength, high wear resistance, no hand injury, long service life, and can guarantee long-term work. Deburring: this product can quickly remove rusty screw burrs, and the nut can be easily opened or tightened without replacing expensive screws. Function: it can connect the external deburring bevel to the electric hand drill, which is the best choice for processing copper, iron and stainless steel. Easy to use: use the lowest speed of the drill bit to apply a small force to the nut and achieve the effect of grinding and deburring. Safety Design: This cutting and drilling tool can protect your hands and won't cause sparks, so you can use it easily during you are working. 1: The external chamfering device is suitable for various drills. It can easily remove burrs without hurting your hands. It can be with or without wire polishing. 2: Improve your work efficiency to some extent, ensure the work quality and save the cost of replacing new parts. Size 0.1-0.3 inch size difference due to manual measurement within the normal range . Color may differ slightly due to lights, screens etc. . 2.8*2.8*5.1cm