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L4V Hook Deadlocks L4V hook deadlocks are an upgrade to the rear and side van doors, as well as tailgates and doors to the cab. They operate independently of the manufacturer's locking system and are secured by a 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 or applications where the driver may forget to lock th