The McCormick 6677792A1 is a genuine OEM piston ring, essential for maintaining proper engine compression and oil control in various McCormick MTX and MC series agricultural tractors. This precision-engineered component is also compatible with several Case IH MXM models. With a diameter of 100mm, a thickness of 3mm, and a width of 3.5mm, this piston ring is a critical replacement part for engine rebuilds or routine maintenance, ensuring reliable and efficient engine operation.