The NTN Timing Belt Kit - 137767 is a comprehensive set of products designed for servicing a car's timing belt. It includes various essential components that work together to ensure the proper functioning of the timing belt, which controls the timing of the engine's valves. The kit contains a timing belt, tensioner, idler, water pump, and various other components that are necessary for a complete timing belt replacement. These parts are made of high-quality materials and are designed to fit most car models. The kit also comes with detailed instructions for installation, making it suitable for both professional mechanics and DIY enthusiasts. With this kit, car owners can ensure the smooth and efficient operation of their vehicle's engine.