Features: color yellow Material: aluminum, steel, brass. Package includes: 2x keys for that 1x trailer lock in yellow color 1x adapter 13 to 7 Maximum durability: stainless steel, extra strong powder coating and the use of top quality RAL 2009 varnishes guarantee you extreme durability and a great value of theft protection Material: Resulting in incredible security and quality with a material resistant to corrosion and rust free, for all types of weather conditions. Function: These U-shaped locks fit over the coupler on the tongue of the trailer and prevent someone from other to hitch his vehicle to your trailer. Many have ball-shaped tops to go where your vehicle's ball unit would normally go in the coupler. Shortly, it prevents another vehicle from hitching on your truck. High Security: The lock is made of aluminum (housing), high performance steel (lock rod) and of brass (lock cylinder) and thus offers optimum protection against theft. Caravan accessories: With the 13-pin to 7-pin adapter you can connect the car cable with accessories of 7-pin trailer (horse trailer, caravan, car trailer).