Features: [Sturdy Material] This trailer lock is made of high-quality iron and aluminum alloy materials, with a sturdy structure and a galvanized surface, which will not rust and can withstand harsh weather conditions. It is the most durable and longest-lasting coupler lock. [Vehicle Safety] The trailer lock prevents your trailer from being towed away by others when it is unhooked from the vehicle. It adopts a heavy-duty U-lock structure and a striking bright yellow color to prevent trailer theft and prevent picking the lock. [Easy to Use] Simply install the trailer lock to the trailer hitch. The U-shaped lock bar can be adjusted up and down and fixed with a key for easy connection and tight fit, which is very convenient to install and remove. Package Included: 1 Hook Lock 2 Keys SPETLEK Trailer Hitch Lock 50mm Tow Ball Towing Bar Security in Yellow