Flap Disc, Abrasive Type Coated, Abrasive Material Zirconia Alumina, Grade Extra Coarse, Backing Plate Material Fiberglass, Connector Size 7/8 in, Connector Type Unthreaded Hole, Density Rating High, Flap Disc Type Type 27, Overall Diameter 7 in, Series BlueFire R860, Backing Material Cotton, Backing Weight X, Coating Coverage Semi-Open, Grit P40, Maximum Operating Speed 8,600 RPM, Color Blue