The TowSmart 7-Blade to 6-Round Trailer Light Wiring Adapter is the quickest and easiest way to make electrical connections when hauling a trailer that has a different wiring configuration than the vehicle. This adapter is ideal for trailers that require a 6-round connection but have a 7-blade towing vehicle. The adapter connects taillights, brake lights, turn signals, electric brake, auxiliary power, and ground. The single housing design plugs into your vehicle's electrical socket and requires no wiring. It provides an ergonomic, durable plastic construction that is corrosion-resistant to withstand extreme weather.