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Is a Van Hook Lock Worth the Investment? A van hook lock is an effective method of increasing the security of your van. They are fitted to an opening, a connecting panel or a window and operate independently of the locking mechanism. The driver can only operate them using the use of a key. As opposed to straight bolt deadlocks, they lock with a hook style bolt which catches into a receiver keep, offering the highest level of security for your vehicle. High-Security Locks