Scope of delivery: 1 anti-theft hook + 2 keys, yellow, size: 15.5 x 11 cm, thickness: 1.2 cm, suitable for most tow hooks. Robust and durable: Made of high quality iron + aluminum alloy, anti-rust, anti-corrosion, high temperature resistant, fine surface treatment, sturdy, practical and durable. Universal compatibility: 11 locking positions can be adjusted and the size can be adjusted for different types of trailers. Available with 1-7/8" (48mm), 2" (51mm) and 2-5/16" (59mm) fittings. Easy to use: simply attach the lock of tow to the tow bar where the vehicle's ball usually sits, then let it engage and secure with the key. Deterrent: After installing the trailer hitch lock, the thief immediately loses interest. The bright yellow design provides a high level of warning and protection. Even in the dark, thieves know immediately that they have no chance of stealing the trailer