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How to Secure Your Van With Hook Locks Lock merchandise on display hooks easily without disrupting store layout. These locks prevent theft by preventing large quantities of merchandise from being taken at one time. Hook locks, unlike deadlocks, come with a locking mechanism that snaps closed when a load is attached to prevent the lock from being opened. They are a cost-effective way to upgrade the security of any van. They can be installed by all major manufacturers of vehicles including Ci