【Pure Copper 10 AWG Core】ETL approved. This VEVOR 40A welding extension cord features 10 AWG pure copper wires with STW heavy-duty jacket. Rated at 250V & 40A, it delivers stable power with minimal voltage drop over 50 feet. Idea for MIG, TIG, Plasma, for Lincoln, and for Miller welders. Temp range: -40°F to 140°F. 【NEMA 6-50 Male & Female Plug】Equipped with NEMA 6-50P (male) and 6-50R (female) plugs, this 250V (compatible 220V-240V) welding extension cord ensures a secure, spark-resistant connection. Standard configuration for most industrial welders. 【50FT Long Reach + Portable Strap】Extend your power up to 50 feet. The built-in strap allows tangle-free storage and easy transport – perfect for workshops, garages, or outdoor job sites. Ideal for large workpieces. 【ETL Certified & Weather Resistant】ETL certified for electrical safety. The STW jacket resists rain, splash, oil, and sunlight. Ideal for indoor/outdoor welding. Note: Not for RV or dryer use – designed exclusively for welding equipment. 【Wide Compatibility】Works seamlessly with VEVOR, for Lincoln, Miller, Hobart, Forney, and other 220V-250V welders. Perfect for MIG, TIG, ARC, Plasma cutters. Also available in 30A, 50A, and 25ft lengths – select the right fit for your welding needs.