1.Highquality material: our external chamfer deburring tool is made of highquality metal material, which is durable, high hardness, rustproof and corrosion resistant, and can be used for a long time. Get cleaner and more efficient burr removal. 2.Easy installation: no additional tools required. Simply attach the external chamfering tool to a suitable drill for successful installation for deburring. The installation is also easy for inexperienced users. 3.Easy to use: this external chamfer deburring tool is easy to use and requires no complicated steps. You simply place the screw in the appropriate place of the deburring tool and apply light pressure to complete the deburring process. Easy to do in just 12 minutes. 4.Safe and comfortable: with the external chamfer deburring tool, damaged screws and fasteners can be repaired. Quickly repair damaged screws and tighten nuts. The burrs on the outer edge of the screw can be easily removed without cutting your hands, which ensures your work .