Genuine OEM Audi Camshaft Belt Disc Hub, part number 038109239L. This precision-engineered hub is a vital component in the engine's timing system, responsible for connecting the camshaft to the timing belt. It ensures the precise synchronization of camshaft rotation with the crankshaft. Weighing 1.474 kg and with a diameter of 0.135 m, this metal hub is manufactured to exact tolerances, which is critical for maintaining accurate engine timing and preventing severe engine damage.