The McCormick 6677990A1 Belt Kit is a genuine OEM replacement part designed for a wide range of McCormick X4, X5, X6, X7, and X8 Series tractors. This essential kit ensures optimal performance and reliability of the tractor's belt-driven systems. Manufactured to McCormick's stringent specifications, it provides precise fitment and durability for various models including X4.20, X5.50, X6.440, X7.690, and X8.680, among others. With a weight of 0.12 kg and dimensions of 95mm length, 51mm width, and 51mm height, this kit is engineered for direct replacement.