The McCormick 3663128M3 Piston Ring is a genuine OEM component designed for various Massey Ferguson agricultural and industrial machinery. This high-quality piston ring features a 101.6mm (4 inch) bore and a 2.3mm (0.091 inch) thickness, crucial for maintaining proper engine compression and oil control. It is engineered to meet original equipment specifications, ensuring reliable performance and extended engine life in compatible models.