Flap Disc, Abrasive Type Coated, Abrasive Material Zirconia Alumina, Grade Coarse, Backing Plate Material Eco-Trim, Connector Size 7/8 in, Connector Type Unthreaded Hole, Density Rating Standard, Flap Disc Type Type 27, Overall Diameter 4 1/2 in, Series ENDURO-FLEX, Backing Material Fiberglass, Grit 40, Maximum Operating Speed 13,300 RPM, Features Trimmable