This piston ring set is designed to fit Cummins ISB QSB engines with precision and accuracy. Made in China, this set is a reliable choice for those in need of heavy equipment parts and accessories. The set includes a piston ring and other necessary components for proper installation and functionality. The model number for this set is 4089460 3932520 3904531, and it is suitable for use in a variety of industrial settings. Whether you are in need of parts for your Cummins engine or simply require a reliable piston ring set, this set is an excellent choice.