Unitized Wheel Mandrel, Abrasive Mounting Connector Size 1/2 in, Abrasive Mounting Connector Type Unthreaded Hole, Tool Mounting Connector Size 1/4 in, Tool Mounting Connector Type Straight Shank, Overall Length 3 1/16 in, Product Type Unitized Wheel Mandrel, Outside Flange Diameter 2 1/2 in, Compatible Wheel Diameter (Maximum) 6 in, Compatible Wheel Diameter (Minimum) 3 in, Compatible Wheel Thickness (Maximum) 1 in, Compatible Wheel Thickness (Minimum) 1/4 in, Maximum Operating Speed 12,000 RPM