Radnor Standard Duty Copper Nozzle with 1/2" bore size is designed to be used with all Tregaskiss style MIG guns. Brass insert is included to maintain inner diameter and to avoid rocking of nozzle. The rounded edges and smooth surface finish of the nozzle reduce weld spatter build-up. A high temperature resistant, fiberglass insulator electrically insulates nozzle from the diffuser. Long lasting nozzle with a recessed contact tip relationship is durable and is sold as 2 per pack.