J1548 Flap Disc Abrasive Type Coated Abrasive Material Ceramic Grade Coarse Backing Plate Material Fiberglass Connector Size 7/8 in Connector Type Unthreaded Hole Density Rating Standard Flap Disc Type Type 29 Overall Diameter 4 1/2 in Series Predator AF Backing Material Polyester Backing Weight Y Coating Coverage Closed Grit 40 Maximum Operating Speed 13 300 RPM Color Yellow Features Hard Edge