Combination 7-way socket and 4-way flat socket that eliminates the need for an adapter! Very easy to install with a snap fit assembly for most late model trucks and sport utility vehicles. Plugs directly into the existing OEM vehicle harness system for new installations. The socket features a high-impact nylon shell, stainless steel spring and rubber gasket to guarantee against moisture intrusion when closed. Seven-way and 4-way should not be used simultaneously. mounting hardware and installation instructions included.HOPPY