Unitized Wheel Abrasive Material Aluminum Oxide Density Rating Soft (4) Grade Fine Series Bear-Tex Rapid Blend NEX Face Width 1/4 in Maximum Operating Speed 12 000 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