Hubbells 50 amp Twist-Lock devices feature a heavy duty design built for heavy duty applications. These Hubbell 50 amp Twist-Lock plugs and connector bodies are built to go where you need power, even in some of the harshest environments. On the outside, 50 amp plugs and connectors are made of super tough nylon for better impact resistance. On the plug, the stainless steel shroud not only provides protection and durability, but safety as well. Thats because the rigid construction restricts distortion, thus minimizing the possibility of mating incorrect devices.On the inside are the kinds of features that separate Hubbell from all the rest. The cord grip has been designed with offset gripping jaws to securely hold the conductors not just the cord jacket. Hubbells box terminals speed wiring and provide a superior termination. The plugs thermoplastic polyester interior provides excellent heat resistance without compromising strength. In all, its the combination of function and performance that Hubbell demands of all its products. That is why we will never add a feature that compromises performance.