Unitized Wheel Abrasive Material Aluminum Oxide Density Rating Medium (5) Grade Medium Series Bear-Tex Vortex Rapid Blend Face Width 1/2 in Maximum Operating Speed 18 100 RPM Overall Diameter 3 in Connector Size 3/8 in Connector Type Unthreaded Hole Quick Change System Not Applicable Abrasive Type Non-Woven Color Blue Resistance Properties Smear