Flap Disc Abrasive Type Coated Abrasive Material Ceramic Grade Coarse Backing Plate Material Fiberglass Connector Size 5/8 In.-11 Connector Type Threaded Hole Flap Disc Type Type 29 Overall Diameter 7 in Series Apex Backing Material Polyester Backing Weight Y Grit 80 Maximum Operating Speed 8 600 RPM Features Hard Edge