Unitized Wheel Abrasive Material Aluminum Oxide Density Rating Hard (8) Grade Coarse Series Bear-Tex Rapid Blend NEX Face Width 1/4 in Maximum Operating Speed 18 000 RPM Overall Diameter 3 in Connector Size 3/8 in Connector Type Unthreaded Hole Quick Change System Not Applicable Abrasive Type Non-Woven Color Brown Resistance Properties Smear