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Why Buy a Hook Lock For Van? A hook lock for your vehicle is an excellent investment to improve your vehicle's security. These mechanical locks are fitted to your doors and connecting bodywork, and operate by putting a hook-style bolt into a receiver, when operated by an external key. They are great for couriers and tradespeople who often leave their vehicles unlocked between deliveries. There are other kinds of locks that you can consider too - slam locks, and deadlocks. Durability Van owners should look for ways to protect them