The Genuine Audi High Intensity Discharge Lighting Ballast Bolt is a bolt specifically designed for use with Audi vehicles. It is used to secure the high intensity discharge lighting ballast, which is responsible for providing the bright and efficient lighting for the vehicle. This bolt is made of high-quality materials and is an authentic Audi product, ensuring a perfect fit and reliable performance. It is compatible with various Audi models and is a crucial component in the proper functioning of the vehicle's lighting system.