This 1/2-inch, self-insulated nozzle is for use with Tweco Spitfire 180 A MIG guns and can be used with standard gas diffuser, part number 51 (stock number 1510-1101) and part number 51-23 (stock number 1510-1100). It has a bore diameter of 0.500 inch (12.7 millimetres) and is made of 122 DHP copper alloy.