Scope of delivery: 1 anti-theft hook and 2 keys, yellow, size: 15.5 x 11 cm, thickness: 1.2 cm, suitable for most tow hooks. Sturdy and durable: Made of high quality iron and aluminum alloy, rustproof, 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 or 8" (48mm), 2" (51mm) and 2-5 or 16" (59mm) fittings. Easy to use: Simply attach the tow lock to the tow bar where the vehicle's ball usually sits, then let it click into place 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 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.