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Van Hook Deadlocks Van hook deadlocks function independently of the factory lock system. They are equipped with a hook-style bolt that latches onto the receiving bracket. This makes them more difficult to break in. They are particularly useful in stopping "Peel and steal". They also help prevent criminals from taking away your catalytic convertor which converts harmful pollutants into safer gasses. Hook Locks Van hook deadlocks are operated with a key and work independently of the lock supplied by the manufacturer.