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L4V Hook Deadlocks L4V hook-deadlocks are a great upgrade for the back and side van doors, as well as tailgates or doors to the cab. They are not tied to the locking system of the manufacturer and secured with a high security key. Specially designed to ward off attacks using 'peel and take' this product has been independently tested increasing resistance by up to 300%. It is ideal for multi-drop couriers and applications where the driver might forget to lock the car do