Copper Nozzle with 1/2" bore size is designed for standard gas diffuser for use with up to 250 A Tweco® no.2 MIG guns. 2.1" Nozzle with 3/4" OD is ideal for use in light to medium duty welding application up to 250 A. It features part number rolled stamped on the outer surface for easy identification. It has nozzle housing, which is cut and formed from copper alloy tubing. It is adjustable to obtain the recess contact tip. It slides over the standard nozzle insulator. Nozzle with adjustable recess to protruding contact tip relationship is made of 122 DHP copper alloy and is best suited for higher heat applications requiring longer electrical stick-out or in cases where the nozzle touches the work piece.