Flap Disc Abrasive Type Coated Abrasive Material Zirconia Alumina Grade Coarse Backing Plate Material Fiberglass Connector Size 7/8 in Connector Type Unthreaded Hole Density Rating Standard Flap Disc Type Radial Overall Diameter 6 in Series Z SGP CURVE Backing Material Fiberglass Backing Weight X Grit 40 Maximum Operating Speed 10 200 RPM