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L4V Hook Deadlocks L4V hook deadlocks are an upgrade for side and rear van doors, as well tailgates and doors to the cab. They work independently of the manufacturer's locking system and are secured with a high-security key. This product, designed to ward off 'peel-and-steal' attack, has been independently tested and can increase resistance by as much as 300%. It is ideal for multi-drop couriers and applications where the driver may not lock the door of the vehicle. Hook Deadlock