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L4V Hook Deadlocks L4V hook-deadlocks make a great upgrade for back and side van doors as well as tailgates or doors for cabs. They operate independently of the manufacturer's locking system and are secured with a high-security key. This product, designed to stop 'peel and steal' attacks has been tested independently and can boost resistance by as much as 300 percent. It is ideal for multi-drop couriers or applications where the driver might overlook locking the door of their vehicle. Hook Deadlock A hook deadloc