Flap Disc Abrasive Type Coated Abrasive Material Ceramic Grade 60 Backing Plate Material Fiberglass Connector Size 5/8 In.-11 Connector Type Threaded Hole Density Rating Standard Flap Disc Type Type 27 Overall Diameter 7 in Quick Change System Not Applicable Series Predator Ambush Backing Material Cloth Backing Weight Y Coating Coverage Closed Grit 60 Maximum Operating Speed 8 600 RPM