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What is a Hook Lock Van? Hook lock vans are a mechanical form of deadlock that is independent of the locking system of your manufacturer, fitted to the door and connecting panel by a hook style bolt which connects to a receiving bracket that provides security at the top of the line. They can be keyed together with your other van locks so that you only have one key for all your locks. They can also be equipped with lock shields to protect the cylinder from being attacked by crowbars