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L4V Hook Deadlocks L4V hook-deadlocks make a great upgrade for the back and side van doors and tailgates or cab doors. They function independently of the manufacturers locking system and are secured using a a high-security key. This product, designed to ward off 'peel-and-steal' attack has been tested independently and can increase resistance by up to 300 percent. It is perfect for multi-drop couriers as well as applications where the driver is unable to lock the vehicle door. H