About this item Tap Size Length: 5.00″/127.00mm, Thread Head: 0.98″/25.00mm, Square Head: 16.0mm x 16.0mm (L*W), Shank Diameter:20.0mm, Pitch: 18 TPI. Die Size OD: 2.56″/65mm, Thick: 0.55″/14mm. Application Make or repair thread, suitable for most metals, copper, alloy steel, cast iron, aluminum, brass, abrasive steel, A3 steel, iron plate ETC. Usage Can be used with manual equipment or special processing consoles for tapping, Appropriate addition of coolant can extend the service life when tapping. Package Include 1 pc 1 1/8-18 UNFF Thread Tap & 1 pc 1 1/8-18 UNFF Round Die.