Flap Disc Abrasive Type Coated Abrasive Material Zirconia Alumina Grade Coarse Backing Plate Material Eco-Trim Connector Size 5/8 In.-11 Connector Type Threaded Hole Density Rating Standard Flap Disc Type Type 27 Overall Diameter 4 1/2 in Series ENDURO-FLEX Backing Material Cloth Grit 40 Maximum Operating Speed 13 300 RPM Features Trimmable