Flap Disc Aluminum Abrasive Type Coated Abrasive Material Zirconia Alumina Grade 40 Backing Plate Material Not Applicable Connector Size 7/8 in Connector Type Unthreaded Hole Density Rating Standard Flap Disc Type Type 27 Overall Diameter 7 in Quick Change System TS Series ENDURO-FLEX ALU Backing Material Eco-Trim Backing Weight Not Applicable Coating Coverage Not Applicable Grit 40 Maximum Operating Speed 8 600 RPM Features Trimmable