Flap Disc Abrasive Type Coated Abrasive Material Zirconia Alumina Grade Coarse Backing Plate Material Plastic Connector Size 5/8 In.-11 Connector Type Threaded Hole Density Rating High Flap Disc Type Type 27 Overall Diameter 4 1/2 in Series HP MAXTRIM Backing Material Cotton/Polyester Backing Weight YF Grit 60 Maximum Operating Speed 13 300 RPM Features Trimmable