Flap Disc, Abrasive Type Coated, Abrasive Material Zirconia Alumina, Grade Medium, Backing Plate Material Phenolic, Connector Size 7/8 in, Connector Type Unthreaded Hole, Density Rating High, Flap Disc Type Type 27, Overall Diameter 4 1/2 in, Quick Change System Not Applicable, Series Tiger Paw HD, Backing Material Phenolic, Backing Weight X, Grit 80, Maximum Operating Speed 12,000 RPM