30A/50A, 125/250V, Black, 3 Pole, 3 Wire Not Grounding, Dual Power Range/Dryer Angle Plug, NEMA 10-30/10-50, UL, Federal Specification, CSA, Interchangeable Blades Allowing Either A 30A, Or 50A, Configuration, UL Listed For Use With Aluminum Wire, Dead Front Design, Box.