Quick-thread assembly screws and cord-grip screws come backed-out and ready-to-wire|Industrial-strength, brass alloy plug blades and connector contacts resist heat rise, provide excellent conductivity|Raised ribs provide non-slip gripping profile for turning to lock and unlock|Double dovetail design provides superior protection against cord pull-out forces|Impact and corrosion resistant durable nylon 6/6 shell material|Rounded back contour reduces snags and hang-ups on the job site|Scallop shell design provides non-slip gripping surface for insertion and withdrawal|Visible stamped NEMA configuration and device rating|New design external cord grips provide visible assurance of safe and proper cord retention|Integral flexible rubber cord grommet conforms to and seals around SO cord to provide protection from oils, water or chips entering wiring chamber|Plug mounting