Cratex Straight Wheel: Rubberized Abrasive. Extra fine grit texture. Wheel Measures 2 1/2 in. diameter with a thickness of 3/8 in. and an arbor hole of 1/4 in. The Part # is 256-XF. Maximum Safe Spped is 8300 RPM. Grat for removing rust, heat marks, tarnish, excess solder, scratches, corrosion, blending in and polishing welded seams after rough grinding, polishing bearing surfaces and raceways, removing burrs and breakind edges, smoothing and polishing, wet sanding of gem gastings, wet standing of gem stones, trimming plastic articles, smoothing glass edges, cleaning before welding or soldering. MADE IN THE USA. NEW.