The McCormick 3534485M1 is a genuine OEM piston ring designed for a cylinder bore of 91.44 mm and a thickness of 2.38 mm. This essential engine component ensures proper compression and oil control in a wide range of agricultural and industrial machinery. It is compatible with McCormick CX and MC series tractors, various Massey Ferguson models, and Landini tractors equipped with compatible Perkins engines such as A4.236 and A6.354. This direct replacement part ensures optimal engine performance and longevity.