Fiber Disc, Abrasive Type Coated, Abrasive Material Aluminum Oxide, Backing Material Fiber, Backing Weight Not Rated, Grit 80, Overall Diameter 4 in, Series F240, Maximum Operating Speed 12,000 RPM, Resistance Properties Tear, Connector Size 5/8 in, Connector Type Unthreaded Hole, Color Brown, Grade Coarse