This is "30 Amp, 250 Volt, NEMA 6-30R, 2P, 3W, Flush Mtg Receptacle, Straight Blade, Industrial Grade, Grounding, , Side Wired, Steel Strap, - Black". Single Outlet are designed and manufactured to withstand the harsh conditions typically associated with industrial environments. Available in a wide variety of configurations, including isolated ground, tamper-resistant, hospital grade, this industrial grade device is the electrical contractor's choice for use in factories, schools, hospitals, and commercial office buildings.