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 Standard, Flap Disc Type Type 29, Overall Diameter 4 1/2 in, Series XC1176, Backing Material Fiberglass, Backing Weight Y, Grit 36, Maximum Operating Speed 13,300 RPM