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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 a high-security key. They're a great way to protect yourself against door-peeling burglaries, since they attach to the bracket for the receiver and make it difficult to force open. These can be fitted to the rear and side doors of most vans. They are a type of mechanical deadlock Van Security hook locks represent the most modern van security deadlocks.