Flap Disc, Abrasive Type Coated, Abrasive Material Zirconia Alumina, Grade Medium, Backing Plate Material Plastic, Connector Size 7/8 in, Connector Type Unthreaded Hole, Density Rating Standard, Flap Disc Type Type 27, Overall Diameter 4 1/2 in, Series BlueFire R884P, Backing Material Plastic, Coating Coverage Semi-Open, Grit 80, Maximum Operating Speed 13,300 RPM, Features Trimmable, Package Quantity 2