Tweco® Coarse Threaded Copper Nozzle with 0.375" bore size is designed for nozzle insulator and is machined from a solid copper alloy bar to provide consistent dimensional stability as well as efficient heat dissipation. 1.75" Nozzle with 1.07" 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. It has a 2-piece design and is made of 145 tellurium copper alloy. Nozzle with recess contact tip relationship 0.125" - 0.156" is designed for use with up to 450 A Tweco® No. 4 MIG guns. It is sold as 2 per pack.