The McCormick 6679912A1 is an authentic OEM tensioner roller designed for a wide range of McCormick X-series tractors, including X4, X5, X6, X7, and X8 models. This critical component ensures optimal belt tension, contributing to the efficient operation and longevity of the engine's accessory drive system. Manufactured to McCormick's stringent quality standards, it features an outer diameter of 70 mm, an inner diameter of 17 mm, and a width of 25 mm, weighing 0.2 kg. Trust genuine McCormick parts for reliable performance and perfect fit.