J0643 Flap Wheel Abrasive Material Aluminum Oxide Abrasive Type Coated Backing Material Cotton Backing Weight Y Grit P60 Series R369 Flap Width 1 1/2 in Maximum Operating Speed 25 000 RPM Shank Size 1/4 in Overall Diameter 1 1/2 in Grade Coarse Shank Type Straight Coating Coverage Closed Resistance Properties Wear