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L4V Hook Deadlocks L4V hook-deadlocks are a great upgrade for side and back van doors, as well as tailgates or cab doors. They work independently of the manufacturers locking system and are secured with a high-security key. Designed specifically to combat 'peel and steal' attacks this product has been tested by an independent lab increasing resistance by as much as 300 percent. It is ideal for multi-drop couriers and applications where the driver may overlook locking the door o