Flap Wheel Abrasive Material Aluminum Oxide Abrasive Type Coated Backing Material Cotton Backing Weight X Grit 120 Series Not Applicable Flap Width 1 in Maximum Operating Speed 25 000 RPM Shank Size 1/4 In.-20 Overall Diameter 1 1/2 in Grade Medium Shank Type Threaded Coating Coverage Closed Resistance Properties Heat