Straight Blade Receptacles: Type - Single Locking; Rating - Amps - 20A; Rating - Volts - 120/208V 3 PhaseY; Number of Poles - 4P; Number of Wires - 5W; Ground - Grounding; NEMA - L21-20R; Mounting - Flush; Material - Nylon; Color - Black; Face OD - 1.55 in; Manufacturer Brand - Turnlok