1 piece compact version adapter for 6-30P plug into welder 6-50 240V outlet. Molded with electroplated copper terminal in order to avoid surface oxidation effectively. Welder 50 AMP 3 prong NEMA 6-50 250V 3-prong male plug. Workshop 3 prong 6-30 female. Used 10AWG conductor inner wire, support max 30 AMP loading. Heavy-duty 100% copper wire conductor inside.