Flap Disc Abrasive Type Coated Abrasive Material Ceramic Grade Extra Coarse Backing Plate Material Fiberglass Connector Size 5/8 In.-11 Connector Type Threaded Hole Flap Disc Type Type 27 Overall Diameter 7 in Series Apex Backing Material Polyester Backing Weight Y Grit 36 Maximum Operating Speed 8 600 RPM