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