Process: high frequency quenching and hardening treatment. This tool for chamfering is suitable for stainless steel with or without thread, hardened steel, mild steel, copper, brass, aluminum, fiberglass, wood, plastic. The operation is simple, using the lowest speed on the drill bit, and then slightly applying pressure to remove the burr. Removing burrs does not hurt the hands and improve efficiency. It is suitable for all kinds of chuck drill and meet different needs. Name:External chamferer, chuck electric drill chamfering tool Colour:B:Gold Material:Metal Package Contents: 3 * Triangular Handle Chamfer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.