J5078 Flap Disc Abrasive Type Coated Abrasive Material Zirconia Alumina Grade Medium Backing Plate Material Plastic Connector Size Not Applicable Connector Type Threaded Hole Density Rating Standard Flap Disc Type Type 27 Overall Diameter 3 in Quick Change System TR Series BlueFire R884P Backing Material Cotton Backing Weight X Coating Coverage Semi-Open Grit P120 Maximum Operating Speed 30 000 RPM Color Black