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What is a Hook Lock Van? A hook lock van is an independent mechanical deadlock that operates independently of the manufacturer's locking system. comes with a hook-style bolts that hook into the receiving bracket and provides greater security. They can be keyed together with the other van locks, so you only have one key for all your locks. They can also be equipped with lock shields that protect the cylinder from being attacked by crowbars. Hook Locks When it comes to securing your vehicle