Flap Disc Abrasive Type Coated Abrasive Material Zirconia Alumina Grade Medium Backing Plate Material Not Applicable Connector Size 7/8 in Connector Type Unthreaded Hole Density Rating Not Applicable Flap Disc Type Type 29 Overall Diameter 7 in Series Not Rated Backing Material Cloth Backing Weight X Grit 80 Maximum Operating Speed 8 600 RPM