The McCormick 6712166A1 is a genuine OEM piston ring designed for various McCormick tractor models, including CX, MC, MTX, XTX, and ZTX series. This essential engine component helps maintain proper compression and oil control within the engine's cylinders. With an outer diameter of 100 mm, an inner diameter of 90 mm, and a thickness of 2.5 mm, it is engineered to meet original equipment specifications for reliable performance in Perkins 1000 series engines.