Fiber Disc, Disc Diameter 4 1/2 in, Mounting Hole Size 7/8 in, Abrasive Type Coated, Abrasive Material Ceramic, Abrasive Grit 50, Abrasive Grade Coarse, Disc Backing Material Fiber, Backing Weight X, Max. RPM 13,000 RPM, Series F980, Color Orange, Attachment Type AVOS Speed Lok