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L4V Hook Deadlocks L4V hook deadlocks are an upgrade for side and rear van doors, as well as tailgates and doors for cabs. They are independent of the locking system of the manufacturer and secured with a high-security key. Specially designed to ward off attacks of 'peel and steal' this product has been tested by an independent lab increasing resistance by as much as 300 percent. It is perfect for multi-drop couriers as well as applications where the driver may forget to lock the door of their