The McCormick 3429317M1 Piston Ring Set is a genuine replacement component designed for Perkins engines with a 91.49mm bore. This set includes three piston rings with specific heights: 2.38mm for the top compression ring, 2.38mm for the second compression ring, and 4.76mm for the oil control ring. It ensures optimal engine compression and oil control, contributing to efficient engine performance and longevity. This piston ring set is compatible with a wide range of agricultural machinery, including various McCormick, Massey Ferguson, Landini, and Valtra tractor models.