Removing rust, heat marks, tarnish, excess solder, scratches, corrosion, removing burrs and breaking edges Polishing welded seams after rough grinding, polishing bearing surfaces and raceways Smoothing and sanding castings and glass edges Cleaning before welding or soldering Quick way to clean unwanted surface deposits Maximum RPMs. Best results are usually obtained at 30% to 80% using light pressure. 3” – 7,000 RPM 4” – 5,250 RPM 6” – 3,600 RPM Use with wheel mandrel 0264 (1/4” shank).