Locking Plug, Connection Orientation Straight, Current Rating 20 A, Housing Color Black, Housing Material Nylon, NEMA Plug Configuration L21-20P, Number of Blades 5, Number of Poles 4, Phase Three, Polarized Yes, Resistance Properties , Impact , Voltage Rating 120/208V AC, Wire Connection Type Screw Terminals, Wiring Style Standard, Face Diameter 2.21 in, For Maximum Cable Diameter 1.15 in, For Minimum Cable Diameter 0.35 in, Grade Industrial, Grounding Grounded