Flap Disc Abrasive Type Coated Abrasive Material Aluminum Oxide Grade 80 Backing Plate Material Eco-Trim Connector Size 7/8 in Connector Type Unthreaded Hole Density Rating Standard Flap Disc Type Type 27 Overall Diameter 4 1/2 in Quick Change System TS Series ENDURO-FLEX Stainless Backing Material Eco-Trim Backing Weight Not Applicable Coating Coverage Not Applicable Grit 120 Maximum Operating Speed 13 300 RPM Features Trimmable