Flap Disc Abrasive Type Coated Abrasive Material Zirconia Alumina Grade Fine Backing Plate Material Phenolic Connector Size 7/8 in Connector Type Unthreaded Hole Density Rating Standard Flap Disc Type Type 29 Overall Diameter 4 1/2 in Quick Change System Not Applicable Series Tiger Aluminum Backing Material Phenolic Grit 60 Maximum Operating Speed 13 000 RPM Color Blue White Features Performance Coated