Flap Disc, Abrasive Type Coated, Abrasive Material Zirconia Alumina, Grade Medium, Backing Plate Material Eco-Trim, Connector Size 5/8 In.-11, Connector Type Threaded Hole, Density Rating Standard, Flap Disc Type Type 27, Overall Diameter 4 1/2 in, Series ENDURO-FLEX, Backing Material Cloth, Grit 60, Maximum Operating Speed 13,300 RPM, Features Trimmable