https://mathis-husum.federated....journals.com/20-thin
L4V Hook Deadlocks L4V hook-deadlocks make a great upgrade for side and back van doors and tailgates or doors for cabs. They function independently of the locking system and are secured using a high-security keys. Specially designed to ward off attacks using 'peel and take' this product has been tested independently increasing the resistance to 300 percent. It is ideal for multi-drop couriers and applications where the driver might not lock the door of their vehicle.