Non-Woven Depressed Center Disc, Abrasive Material Aluminum Oxide, Grade Medium, Overall Diameter 4 1/2 in, Series Cut and Polish, Maximum Operating Speed 11,000 RPM, Connector Size 7/8 in, Connector Type Unthreaded Hole, Abrasive Type Non-Woven, Disc Shape Type Type 27, Resistance Properties Load, Package Quantity 5