Fiber Disc, Abrasive Type Coated, Abrasive Material Aluminum Oxide, Backing Material Fiber, Backing Weight YY, Grit 36, Overall Diameter 4 1/2 in, Series Aluminum Oxide, Coating Coverage Closed, Maximum Operating Speed 11,000 RPM, Connector Size 7/8 in, Connector Type Unthreaded Hole, Color Red, Grade Extra Coarse, Package Quantity 25