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Van Hook Deadlocks Van hook deadlocks are a great way to add extra security to your vehicle. In contrast to slam locks, they are an entirely separate mechanism that operates independently of the manufacturers lock system. They are a very effective visual deterrent to would be thieves and offer an additional layer of protection from the current tool theft epidemic. Van Guard have fitted thousands of these locks to tradesmen around the UK. High-Security Van hook deadlocks are an extra layer of security to your vehicle.