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L4V Hook Deadlocks L4V hook-deadlocks make a great upgrade for back and side van doors and tailgates or doors for cabs. They work independently of the locking system and are secured using a a high-security key. This product, created to ward off 'peel-and-steal' attack, has been independently tested and can increase the resistance to attacks by as much as 300%. It is ideal for multi-drop couriers and applications where the driver might forget to lock the door of their vehicle. Hook Deadlock A Hook Dead