Weldmark by Tweco WMK21 series MIG nozzle is ideal for medium duty welding applications up to 180 amps. Made of copper and brass, with a threaded connection type, and a standard recessed conical tip. Compatable with MIG guns such as Weldmark 150 Series, WeldSkill® 150, WeldSkill® Spoolgun, Mini-MIG or Professional Classic® No. 1. The 0.50 in bore size is perfect for regular corners and gaps. It is self insulated and ready for use with a standard shielding gas diffuser. Packed in a hanging plastic bag, it is retail ready. Made in Mexico.