Sturdy MaterialThe sturdy structure of the trailer lock is made of high quality iron and aluminum alloy material, the surface is galvanized, will not rust, can withstand harsh weather conditions, the most durable and long-lasting coupler lock. Vehicle SafetyTrailer lock prevents your trailer from being towed by others when it is not towed. It uses heavy duty U-lock construction and highly visible color to prevent trailer theft, preventing pick up and prying. [Lock body size] 5/8" *150mm Easy to UseJust connect the trailer lock to the trailer hitch, the U-shaped lock lever can be adjusted up and down and fixed with a key, which is convenient for the connection and tight fit between the two, easy to install and remove. MultipurposeThe trailer lock includes 2 safety keys and space for most trailer hitches. Universal Coupling Lock attaches to the tongue of a trailer, camper, RV or boat trailer for extra protection when you are away.