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hook deadlocks work independently from the vehicle's factory lock system. They are equipped with a hook-style bolt that latches onto an receiving bracket. This makes it harder to get into. They are particularly helpful in helping to prevent "Peel and Steal" crimes. They also stop criminals from removing your catalytic convertor that converts harmful pollutants into safer gases. Hook Locks Van hook deadlocks function independently of the manufacturer lock and can be operated with a key to give you another layer of security. These deadlocks are great