The McCormick 358957X1 is a genuine OEM piston compression ring designed for International Harvester and McCormick agricultural tractors. This essential engine component measures 79.37 mm in bore diameter and 2.36 mm in thickness, ensuring proper engine compression and performance. It is compatible with various models including the B250, B275, B414, 275, 276, 354, 374, 384, 434, 444, 454, 474, 475, 574, 674, 2400, and 2500 series.