Check the listing for details. Schrader Valve Lock Rings/Nuts. Condition: New. Listed at 4.99 USD. Six total Schrader lock rings per bag These will only work on Schrader valves (car style valves) The Schrader Valve Lock Rings/Nuts are essential components for securing Schrader valves on bicycle inner tubes. These small metal rings/nuts are specifically designed to fit onto the valve stem and secure it in place.