Flap Disc, Abrasive Type Coated, Abrasive Material Zirconia Alumina, Grade Medium, Backing Plate Material Phenolic, Connector Size 5/8 in, Connector Type Unthreaded Hole, Density Rating Standard, Flap Disc Type Type 29, Overall Diameter 4 in, Quick Change System Not Applicable, Series Tiger, Backing Material Phenolic, Backing Weight X, Grit 60, Maximum Operating Speed 15,000 RPM