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How to Secure Your Van With Hook Locks Easily lock merchandise on display hooks and not disrupt the store layout. These mechanical locks deter theft by stopping large quantities of merchandise from being removed at once. Hook locks, unlike deadlocks, have a locking system that snaps closed when a load has been connected to prevent the lock from being opened. These locks are a cheap way to upgrade the security of any van. They are available by most automobile manufacturers, including Citroen Peugeo