Great for repairing damaged bolts and fasteners. Easily shaves down the outer edges of a flatted bolt. Effective on Stainless, Hardened Steel, Mild Steel, Copper, Brass, Wood, Fiberglass, Hard Plastic. Works on 1/8' (3mm) to 3/4' (19mm) Round Stock, Bar Stock, Threaded Rod, Screws and more. Upgraded Heavy Duty TUNGSTEN Blades. Superior hardness and strength when deburring Stainless Steel. Offers better performance and longevity compared to high speed steel blades. Easily attaches to the end of your standard power drill chuck with a 1/4” hex shank. Operates with sufficient lubrication and less than 400 RPM. Only requires slight pressure to remove burrs and repair.