Flap Disc, Abrasive Type Coated, Abrasive Material Zirconia Alumina, Grade Medium, Connector Size 5/8 In.-11, Flap Disc Type Type 29, Overall Diameter 4 1/2 in, Series Encore Ceramic, Backing Material Fiberglass, Backing Weight X, Grit 80, Maximum Operating Speed 13,300 RPM