The McCormick 6677854A1 is a genuine OEM piston ring designed for use in McCormick CX series agricultural tractors. This critical engine component features a 100mm bore, playing a vital role in maintaining proper cylinder compression and regulating oil consumption within the engine. It is compatible with a range of McCormick CX models, including CX70, CX75, CX80, CX85, CX90, CX95, CX100, CX105, CX110, and CX115. This part is also found in some Case IH CX series tractors, ensuring broad applicability across compatible CNH Industrial machinery.