Industrial Specification Grade 50A Locking Devices - California Standard Pro-Grip Plug & Connector, 50A, 3Ø 250V/AC Non-NEMA 3-Pole/4-Wire. Arrow Hart’s unique Pro-Grip design allows for quick and easy termination and assembly, saving valuable time on the job site. Superior design combined with rugged materials make Arrow Hart 50A devices ideal for temporary power applications.Design Features:• Pro grip lock provides visual confirmation that device is assembled properly• Deep tapered wire wells accept up to #4 AWG UL wire – key forlong cable runs• Glass-filled nylon body for superior strength and heat performance• Unique 3-step assembly process for pro grip plugs and connectors• Single piece heavy-duty plated mounting strap• Stainless steel tri-combo assembly screws• Receptacles utilize rugged, single piece plated mounting strapfor corrosion resistance• Primary applications are temp power, generators, heavy equipment