FEATURES:- Quick-thread assembly screws and cord-grip screws come backed-out, 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 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.