Genuine OEM Audi Alternator Belt Pulley, part number 06H903119C. This crucial component is part of the accessory drive system, transmitting power from the engine's serpentine belt to the alternator. It ensures the alternator rotates efficiently to generate electrical power for the vehicle's systems and to recharge the battery. Weighing 0.608 kg and measuring 0.064m x 0.064m x 0.045m, this pulley is engineered for smooth operation and durability. Choosing a genuine OEM alternator pulley guarantees precise manufacturing tolerances, proper belt alignment, and reliable long-term performance, minimizing vibration and wear on the belt and alternator.