The McCormick 503937M1 Piston Ring Set is a genuine OEM component designed for various agricultural machinery, including Massey Ferguson and Landini tractors. This high-quality piston ring set features a bore diameter of 91.44 mm (3.600 inches), ensuring optimal engine compression and performance. It is an essential part for engine overhaul and maintenance, compatible with models such as Massey Ferguson 135, 148, 230, 240, 250, 35, 35X, 550, 65, and Landini 5500, 5830, 6030.