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