Flap Wheel, Abrasive Material Aluminum Oxide, Abrasive Type Coated, Backing Material Cotton, Backing Weight Y, Grit P40, Flap Width 1 in, Maximum Operating Speed 25,000 RPM, Shank Size 1/4 in, Overall Diameter 1 1/2 in, Grade Extra Coarse, Shank Type Straight, Resistance Properties Wear