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 durability. Universal compatibility: Features 11 adjustable locking positions and adjustable size to fit various trailer types. Compatible with 1-7/8" (48mm), 2" (51mm), and 2-5/16" (59mm) hitch balls. Easy to use: Attach the lock to the trailer hitch where the vehicle's ball mount sits, secure it by clicking into place, and lock with the included key. Deterrent design: The bright yellow color provides high visibility and acts as a visual deterrent to potential theft. Helps discourage unauthorized removal of the trailer.