Flap Wheel Abrasive Material Aluminum Oxide Abrasive Type Coated Backing Material Cotton Backing Weight X Grit P80 Series R207 Flap Width 1/2 in Maximum Operating Speed 23 000 RPM Shank Size 1/4 In.-20 Overall Diameter 2 in Grade Coarse Shank Type Threaded Coating Coverage Closed Resistance Properties Wear