This product is a comprehensive kit designed for the maintenance and repair of a car's timing belt. Specifically designed for use in Volkswagen and Audi vehicles, the Genuine VW / Audi Timing Belt Kit - 178643 contains everything needed to properly service and replace the timing belt in these vehicles. The kit includes various components such as tensioners, pulleys, and other necessary hardware. It also includes a timing belt, which is a crucial part of the engine that controls the timing of the internal combustion process. This kit provides all the necessary parts to ensure the proper functioning and longevity of the timing belt in a Volkswagen or Audi vehicle.