https://squareblogs.net/grayma....p7/what-is-hook-lock
Van Hook Deadlocks Van hook deadlocks are mechanical locks that function independently of the factory locking system. They have a hook-style bolt that latches onto an receiving bracket. This makes them more difficult to get into. They are especially useful in preventing "Peel and steal". They also stop criminals from removing your catalytic convertor that converts harmful pollutants into safer gasses. Hook Locks Van hook deadlocks are operated with a key and function independently of the