H7340 Flap Disc Abrasive Type Coated Abrasive Material Zirconia Alumina Grade Coarse Backing Plate Material Phenolic Connector Size 5/8 In.-11 Connector Type Threaded Hole Density Rating High Flap Disc Type Type 27 Overall Diameter 4 1/2 in Quick Change System Not Applicable Series Tiger Big Cat HD Backing Material Phenolic Backing Weight X Grit 40 Maximum Operating Speed 12 000 RPM