The McCormick 6645999A1 is a genuine OEM lift arm designed for various McCormick X4, X5, and X6 series agricultural tractors. This essential component ensures proper functionality of the three-point hitch system, providing reliable lifting and lowering capabilities for implements. It measures approximately 800.1 mm in length, 101.6 mm in width, 101.6 mm in height, and weighs around 6.80 kg, ensuring robust performance and durability.