The INA Timing Belt Kit - 135970 is a comprehensive set of products designed for a car's timing belt system. It includes a timing belt, tensioner, and idler pulley, all of which are essential components for ensuring proper engine timing and operation. The kit also includes a water pump, which helps to keep the engine cool and prevent overheating. Additionally, the kit contains a set of tensioner and idler bearings, which help to maintain the proper tension on the timing belt and prevent it from slipping or breaking. These components work together to ensure the smooth and efficient operation of the timing belt system, which is crucial for the overall performance of the car's engine. Overall, the INA Timing Belt Kit - 135970 is a comprehensive and essential set of products for maintaining the timing belt system of a car.