Unitized Wheel, Abrasive Material Aluminum Oxide, Density Rating Hard (8), Grade Medium, Series Bear-Tex Rapid Blend NEX, Face Width 1 in, Maximum Operating Speed 30,000 RPM, Overall Diameter 1 in, Connector Size 3/16 in, Connector Type Unthreaded Hole, Quick Change System Not Applicable, Abrasive Type Non-Woven, Color Brown, Resistance Properties Smear, Package Quantity 50.