Flap Disc Abrasive Type Coated Abrasive Material Zirconia Alumina Grade Coarse Backing Plate Material Fiberglass Connector Size 5/8 In.-11 Connector Type Threaded Hole Density Rating Standard Flap Disc Type Type 29 Overall Diameter 4 1/2 in Series BlueFire R884P Backing Material Cotton Backing Weight Y Coating Coverage Semi-Open Grit P60 Maximum Operating Speed 13 300 RPM Color Blue Package Quantity 2