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L4V Hook Deadlocks L4V hook-deadlocks make a great upgrade for side and back van doors and tailgates or cab doors. They are independent of the locking system of the manufacturer and secured by a high security key. This product, which is designed to combat 'peel-and-steal' attacks has been tested independently and can increase the resistance to attacks by as much as 300%. It is perfect for multi-drop couriers and applications where the driver might forget to lock the car door. Hook Deadlock A Hook Deadlock