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Why Buy a Hook Lock For Van? A hook lock for your van is an excellent investment to improve the security of your vehicle. These locks are mounted on the bodywork and doors. They function by putting the hook-shaped bolt into a receiver, when operated by an outside key. These locks are great for tradesmen and couriers who leave their vehicles unlocked in between deliveries. Other types of locks are also available - deadlocks and slamlocks. Durability