Quick-thread assembly screws and cord-grip screws come backed-out， ready-to-wire

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