Flap Disc, Abrasive Type Coated, Abrasive Material Zirconia Alumina, Grade Coarse, Backing Plate Material Plastic, Connector Size 7/8 in, Connector Type X-Lock, Flap Disc Type Type 27, Overall Diameter 4 1/2 in, Quick Change System X-Lock, Series X-LOCK, Backing Material Plastic, Grit 60, Maximum Operating Speed 13,300 RPM, Features Trimmable