Flap Disc, Abrasive Type Coated, Abrasive Material Zirconia Alumina, Grade Coarse, Backing Plate Material Fiberglass, Connector Size 5/8 In.-11, Connector Type Threaded Hole, Density Rating High, 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