Genuine OEM Audi Idler Pulley with Bolt, part number 03F145276. This component is essential for guiding and maintaining proper tension on the engine's drive belt, ensuring smooth operation of accessories like the alternator and power steering pump. It consists of a black plastic pulley and a metal bolt. Weighing 0.2 kg, a genuine OEM idler pulley provides the correct bearing quality and dimensions for vibration-free service life and reliable belt operation.