Finishing Drum, Abrasive Material Aluminum Oxide, Abrasive Type Coated/Non-Woven, Backing Material Cloth, Backing Weight Not Applicable, Connector Size 5/8 In.-11, Connector Type Threaded Hole, Grit 80, Series Two-In-One, Flap Width 4 in, Maximum Operating Speed 3,800 RPM, Overall Diameter 4 1/2 in, Grade Medium