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. Sturdy and durable: Made of high quality iron and aluminum alloy, rustproof, corrosion-resistant, heat resistant, with fine surface treatment for enhanced strength, practicality, and longevity. Universal compatibility: Features 11 adjustable locking positions and adjustable sizing to fit various trailer types. Compatible with 1-7/8" (48mm), 2" (51mm), and 2-5/16" (59mm) hitch sizes. Easy to use: Attach the tow lock to the tow bar where the vehicle's ball typically sits, secure it into place with a click, and lock with the included key. Deterrent design: The bright yellow color provides high visibility and acts as a visual deterrent to potential theft. Offers increased security when towing.