Flap Wheel Abrasive Material Aluminum Oxide Abrasive Type Coated Backing Material Cotton Backing Weight X Grit P60 Series Super Finish Flap Width 1/2 in Maximum Operating Speed 25 000 RPM Shank Size 1/4 In.-20 Overall Diameter 1 5/8 in Grade Coarse Shank Type Threaded Coating Coverage Closed