The McCormick 6677480A1 is a genuine OEM ignition key specifically designed for a wide range of McCormick X-series agricultural tractors. This essential replacement component ensures reliable starting functionality for models including the X4.20, X4.30, X4.40, X5.35, X5.45, X6.420, X6.430, X7.440, and X7.650. Made to original manufacturer specifications, it guarantees compatibility and durability for your machinery.