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 Standard, Flap Disc Type Type 29, Overall Diameter 4 1/2 in, Series BlueFire R884P, Backing Material Cotton, Backing Weight Y, Coating Coverage Semi-Open, Grit P60, Maximum Operating Speed 13,300 RPM, Color Blue