Flap Disc, Abrasive Type Coated, Abrasive Material Ceramic, Grade 80, Backing Plate Material Fiberglass, Connector Size 7/8 in, Connector Type Unthreaded Hole, Density Rating Standard, Flap Disc Type Type 27, Overall Diameter 4 1/2 in, Series Predator FF, Backing Material Polyester, Backing Weight Y, Coating Coverage Closed, Grit 80, Maximum Operating Speed 13,300 RPM, Color Yellow, Resistance Properties Heat