J1588 Flap Disc Abrasive Type Coated Abrasive Material Zirconia Alumina Grade Medium Backing Plate Material Phenolic Connector Size 5/8 In.-11 Connector Type Threaded Hole Density Rating Standard Flap Disc Type Type 27 Overall Diameter 4 1/2 in Quick Change System Not Applicable Series Tiger X Backing Material Cloth Backing Weight X Grit 60 Maximum Operating Speed 13 000 RPM