The Continental Timing Belt Kit - 135393 is a comprehensive kit of products designed for servicing a car's timing belt. It includes a timing belt, tensioner, idler pulley, and any necessary hardware for installation. The timing belt is a crucial component in a car's engine, responsible for synchronizing the rotation of the camshaft and crankshaft. The timing belt tensioner and idler pulley help maintain proper tension and alignment of the belt, ensuring smooth and efficient operation. This kit is designed to provide all the necessary components for a complete and thorough timing belt replacement, helping to maintain the performance and longevity of the car's engine.