BANDC Waterproof Car Accessory Power Socket Cigarette Lighter Plug Auto Truck 12v Quick Nut:A locking plug looks like a regular male lighter plug but when twisted in this socket can not be pulled out easily, unless twisted again. Beware of low quality look alikes. This is the orignal marine grade locking socket made out of first quality materials. Socket mounts with a retaining nut, not a press fit that can vibrate loose. No metal parts that can rust or corrode. Can be used with a locking plug. This is a kit a high quality female socket. The socket is marine grade and is weather and UV resistant. The contacts are nickel plated and the socket body is heavy nylon plastic. The socket is vibration resistant, unlike less expensive versions. Works with any standard cigarette lighter plug or lockable marine plug.