Flap Disc, Abrasive Type Coated, Abrasive Material Ceramic, Grade Coarse, Backing Plate Material Nylon, 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 Predator HE, Backing Material Polyester, Backing Weight Y, Coating Coverage Closed, Grit 40, Maximum Operating Speed 13,300 RPM, Color Yellow, Features Hard Edge, Trimmable