Tweco® WeldSkill Nozzle with 3/4" bore size is designed for standard gas diffuser and perfect for protecting the quality of your welds as well as the life of your gun. 2.2" Nozzle with 1.057" OD is ideal for use in medium and heavy duty welding application up to 550 A. It features part number rolled stamped on the outer surface for easy identification. Nozzle with recess contact tip relationship 0.125 - 0.156" is made of copper alloy. It is machined from a solid copper alloy to offer consistent dimensional stability as well as efficient heat dissipation. 2-Piece designed nozzle is sold as 2 per pack.