Feature 1High in Security: The U shaped trailer lock installed on the coupler of trailer tongue can protecting the truck or trailer from theft and prevent picking up, prying and drilling. 2Combination Lock: The hitch lock has 4 digit combination password design, and the default password combination 0000 can avoid forgetting the key to ensure better vehicle safety. 3Universal Design: The universal trailer hitch lock is designed to be adjustable with 11 locking positions and can be fitted with 1-7/8in, 2in and 2-5/16in couplers, very useful. 4Premium Material: Combining premium aluminum alloy and alloy steel materials with sturdy structure, the trailer coupler lock is not likely to deform, and durable for long using. 5Better Visuality: The anti theft trailer lock with bright yellow color can provide high visibility trailer protection, which is an essential accessory for all types of trailers.SpecificationItem Type: Trailer Coupler LockMaterial: Aluminum alloy, alloy steel. .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 Coupler Lock1 x Pin1 x User Manual