This high-quality idler gear fit is perfect for Cummins engines X15, QSX, and ISX. It is designed to ensure smooth and efficient performance for your heavy equipment. Made in China, this gear fit is reliable and durable, making it a great choice for heavy-duty applications. Whether you're in need of a replacement part for your Cummins engine or simply want to upgrade your equipment, this idler gear fit is an excellent choice. It is compatible with a variety of heavy equipment parts and accessories, making it a versatile and practical addition to your collection.