Weldmark by Tweco WMK23 series MIG nozzle is ideal for standard duty welding applications up to 300 amps. Made of copper and brass, with a threaded connection type, and a standard recessed conical tip. Compatable with MIG guns such as Weldmark 300 Series, WeldSkill® 150, WeldSkill® 250, WeldSkill® WM250, Professional Classic® No. 2, Professional Classic® No. 3, or Professional Classic® No. 4. The 0.5 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.