Genuine OEM Volkswagen Chain Sprocket, part number 022109116. This sprocket is a component of the engine's timing chain system, engaging with the chain to drive camshafts or other components. It is marked as number 5 in the diagram. The sprocket has a diameter of 0.087 meters and a height of 0.021 meters, weighing 0.26 kg. Genuine OEM sprockets are precision-machined to ensure correct timing and minimal wear.