High Strength Disc, Abrasive Material Aluminum Oxide, Grade Very Fine, Overall Diameter 4 in, Series HS-DC, Maximum Operating Speed 6,000 RPM, Connector Size 1/2 in, Connector Type Unthreaded Hole, Abrasive Type Non-Woven, Backing Weight Not Rated, Coating Coverage Open, Color Maroon, Resistance Properties Load, Wear