Buffing Wheel Mandrel Abrasive Mounting Connector Size 3/8 in Abrasive Mounting Connector Type Unthreaded Hole Tool Mounting Connector Size 1/4 in Tool Mounting Connector Type Straight Shank Overall Length 2 1/8 in Product Type Buffing Wheel Mandrel Compatible Wheel Diameter (Maximum) 4 in Compatible Wheel Diameter (Minimum) 3 in Compatible Wheel Thickness (Maximum) 5/16 in Maximum Operating Speed 20 000 RPM