J7233 Flap Disc Abrasive Type Coated Abrasive Material Zirconia Alumina Grade Extra Coarse Backing Plate Material Fiberglass Connector Size 5/8 In.-11 Connector Type Threaded Hole Density Rating Standard Flap Disc Type Type 27 Overall Diameter 4 1/2 in Series XC1176 Backing Material Fiberglass Backing Weight X Grit 36 Maximum Operating Speed 13 300 RPM