This AC WORKS brand dryer outlet adapter is very durable with a compact design. It is a NEMA 10-30P to NEMA L6-30R. The NEMA 10-30P is a 30 Amp, 125/250 Volt, 3-prong dryer outlet plug. The NEMA L6-30 is a 30 Amp, 250 Volt locking female connector. The product is heavy-duty, compact, and contains nickel-plated pins and terminals to prevent rusting.