Flap Disc Abrasive Type Coated Abrasive Material Ceramic Grade Coarse Backing Plate Material Fiberglass Connector Size 7/8 in Connector Type Unthreaded Hole Flap Disc Type Type 29 Overall Diameter 7 in Series Apex Backing Material Polyester Backing Weight Y Grit 40 Maximum Operating Speed 8 600 RPM Features Hard Edge