Fiber Disc, Abrasive Type Coated, Abrasive Material Ceramic, Backing Material Fiber, Grit 36, Overall Diameter 4 1/2 in, Series Cubitron 1187C, Coating Coverage Closed, Maximum Operating Speed 13,300 RPM, Resistance Properties Tear, Connector Size 7/8 in, Connector Type Unthreaded Hole, Color Purple, Grade Coarse