Flap Disc, Abrasive Type Coated, Abrasive Material Zirconia Alumina, Grade Fine, Connector Size 7/8 in, Flap Disc Type Type 27, Overall Diameter 4 1/2 in, Series Ovation Attacker, Backing Material Fiberglass, Backing Weight X, Grit 120, Maximum Operating Speed 13,300 RPM