The McCormick 528839R1 is a genuine OEM piston ring designed for various International Harvester and McCormick tractor models, including the B414, 276, 354, 374, 384, 434, and 444. This critical engine component ensures proper compression and oil control within the cylinder. With an outer diameter of 95 mm and a thickness of 2.38 mm, this high-quality piston ring is engineered for durability and precise fitment, maintaining optimal engine performance and longevity.