1.INCREASED COMFORT Increase the productivity of your work by easily repairing damaged bolts and tightening nuts with our external chamfer deburring tool. Quickly remove burrs and protect your hands. 2.DURABLE PERFORMANCE Made of rustproof and extremely hard stainless steel, this external chamfer deburring tool has high hardness, durability and strength, ensuring lasting performance. 3.Easy to use: just connect to the drill, gently press the screw head and shape the outer edges of the flat screws. This and effective tool simplifies the repair process and eliminates the need to replace expensive hardware. 4.Three Tungsten Steel Cutters Improve your deburring process with the powerful cutting and repair capabilities of our external chamfer tool. Its quickrelease hex shank fits most drill bits and allows for cleaner and more efficient removal of burrs.