Flap Disc Abrasive Type Coated Abrasive Material Ceramic Grade 60 Backing Plate Material Fiberglass Connector Size 7/8 in Connector Type Unthreaded Hole Density Rating Standard Flap Disc Type Type 27 Overall Diameter 4 1/2 in Quick Change System Not Applicable Series Predator Ambush Backing Material Cloth Backing Weight Y Coating Coverage Closed Grit 60 Maximum Operating Speed 13 300 RPM