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Van Security Hook Locks Van security hook locks offer an extra layer of protection against theft. They function independently of the lock manufacturer's system and are operated with the highest-security key. They're a great defense against door-peeling burglaries, since they hook onto the receiver bracket and make it difficult to force open. They can be mounted on the rear or side door of most vans. They are a type of mechanical of deadlock. Van Security hook locks represent the most recent in van security deadlocks.