Feature 1Wide Application: This trailer wire adapter plug supplies power to the trailer lights. Connect the trailer plug and the vehicle socket to turn on the tail lights, brake lights, and turn lights 2Brass Terminals: This trailer wiring connector plug features brass terminals for excellent electrical conductivity. Durable ABS housing is not easy to damage. 37 Pin to 4 Pin: This trailer adapter plug is suitable for most trailers, cars and vehicles with 7 pin European round plug to 4 pin American flat socket. 4Easy Installation: This round to flat trailer adapter adopts plug and play design, easy to install, time saving and effort saving. 5Secure Connection: This 7 pin to 4 pin trailer adapter provides secure and reliable connection, easy to use.Item Type: Trailer Wire Adapter PlugMaterial: ABS, BrassConversion Type: 7 Pin European to 4 Pin AmericanApplication: Trailer, Towing Truck, RV .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Trailer Wire Adapter Plug