High Strength Disc, Abrasive Material Aluminum Oxide, Grade Medium, Overall Diameter 3 in, Series HS-DC, Maximum Operating Speed 8,500 RPM, Connector Size 1/4 in, Connector Type Unthreaded Hole, Abrasive Type Non-Woven, Backing Weight Not Rated, Coating Coverage Open, Color Maroon, Resistance Properties Load, Wear