Adjustable Copper Nozzle with 0.625" bore size is designed for standard gas diffuser and is used with up to 450 A Tweco® No. 4 MIG guns. 3.42" Nozzle with 0.875" OD is ideal for use in medium to heavy duty welding application up to 450 A. It features part number rolled stamped on the outer surface for easy identification. Nozzle with recess to protruding contact tip relationship is adjustable and is made of 122 DHP copper alloy.