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L4V Hook Deadlocks L4V hook-deadlocks are an excellent upgrade for the back and side van doors as well as tailgates or doors for cabs. They function independently of the manufacturer's locking system and are secured using a a high-security key. This product, designed to ward off 'peel-and-steal' attack has been tested independently and can boost resistance by up to 300 percent. It is perfect for multi-drop couriers and applications where the driver may not lock the d