This genuine McCormick 3689236M91 piston ring is designed for optimal engine performance in various McCormick CX and MC series tractors. Featuring a 100mm bore diameter and 3mm thickness, this essential engine component ensures proper compression and oil control. It is a direct replacement for original equipment, compatible with models such as CX100, CX105, CX110, CX115, CX70, CX75, CX80, CX85, CX90, CX95, MC100, MC105, MC115, MC120, and MC135.