J1589 Flap Disc Abrasive Type Coated Abrasive Material Zirconia Alumina Grade Coarse Backing Plate Material Phenolic Connector Size 7/8 in Connector Type Unthreaded Hole Flap Disc Type Type 27 Overall Diameter 7 in Series Tiger X Backing Material Cloth Backing Weight X Grit 40 Maximum Operating Speed 8 600 RPM