Tungsten fiber knife: Made of extremely hard stainless steel, it has high strength and hardness, long service life, and is rust-proof and corrosion-resistant. Three tungsten steel cutting blades have powerful cutting and repair capabilities, providing clean and efficient burr removal. External chamfering tool: Quickly repair damaged/flattened screws and tighten nuts in place, without hand injury, without sparks, without burns; Connection tube size: 1/8" (3 mm) to 3/4" (19 mm). Very easy to use: simple operation, use the lowest speed of the drill to complete the operation in just 1 to 2 minutes, then apply light pressure to remove burrs. Function: Effective on stainless steel, hardened steel, mild steel, copper, brass, wood, fiberglass, hard plastics. Quickly tighten the chamfering tool into the chuck, using the correct speed and feed. Chamfer angle: 50 degrees (approximately), drill at 0-400 rpm, then apply light pressure to remove burrs. Wide range of applications: Use this angle sander to work on different metals such such as stainless steel, hardened steel, mild steel, brass, copper, aluminum, fiberglass and even wood or plastic. Its simple design and compact size make it very convenient to use and easy to carry in your toolbox. Package contains: chamfer*2