Flap Wheel Abrasive Material Aluminum Oxide Abrasive Type Coated Backing Material Cotton Backing Weight Y Grit P60 Series R369 Flap Width 5/8 in Maximum Operating Speed 30 000 RPM Shank Size 1/4 In.-20 Overall Diameter 1 in Grade Coarse Shank Type Threaded Coating Coverage Closed Resistance Properties Wear