1Applicable Models: Trailer hitch ball lock is fit for 1 to 7/8 in 2in 2 to 5/16in couplers. Please confirm whether your model is applicable before buying. 2Security: Trailer coupler lock is strong cut and shear resistance and high hardness , therefore , it is able to protect your trailer from theft, which is useful and safe. 32 Keys: Trailer hitch lock includes 2 keys, so you can keep the spare keys in a discrete location for emergencies or give it to a friend for helpful access. 4Premium Material: Trailer coupler lock is made of aluminum alloy as well as steel, which is durable, rustproof, weatherproof, and high strength, for a long using life. 5Easy Installation: As coupler ball lock is a perfect substitute, you can directly replace your worn or damaged ones for cost saving and perfect match with the original car.