Flap Disc, Abrasive Type Coated, Abrasive Material Zirconia Alumina, Grade Coarse, Connector Size 7/8 in, Connector Type Unthreaded Hole, Flap Disc Type Type 27, Overall Diameter 7 in, Series Extra Heavy Duty, Backing Material Fiberglass, Grit 40, Maximum Operating Speed 8,600 RPM