This AC WORKS brand electrical vehicle adapter SS21450-018 is heavy-duty and very durable. The adapter is a NEMA SS2-50P to NEMA 14-50R. The NEMA SS2-50 is a 50 Amp, 125/250 Volt, 4-wire male plug. The NEMA 14-50R is a 50 Amp, 125/250 Volt 4-prong female connector. The adapter cable is an STW, 6/3+8/1, 600 Volt jacket with a 50 Amp copper wire. This adapter is used frequently for EV charging and can also be used for a generator and as a marina dock outlet converter.