Hubbell - CS8364CLocking Devices, Twist Lock, Industrial, Female Connector Body, 50A 3 Phase Delta 250V AC, 3 Pole 4 Wire Grounding, Non NEMA, Screw Terminal, Black and White Box terminal with hex socket threaded slug, permits high clamping pressure on conductors without damaging strands Heavy duty two piece external cord clamp provides maximum strain relief Thermoplastic polyester interior provides heat resistance and impact strength Oversized contacts minimize