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L4V Hook Deadlocks L4V are an upgrade to side and rear van doors, as well tailgates and doors to the cab. They are independent of the manufacturer's locking system and secured with a high security key. Specially designed to ward off attacks of 'peel and steal' this product has been tested independently increasing resistance by as much as 300%. It is perfect for multi-drop couriers and applications where the driver may forget to lock the car