The McCormick 3660930M1 is a genuine OEM shim washer designed for precise spacing and alignment in various McCormick agricultural tractor applications. This essential component features an inner diameter of 40 mm, an outer diameter of 55 mm, and a thickness of 0.5 mm, ensuring optimal fit and function within the specified machinery. Manufactured to McCormick's exacting standards, it provides reliable performance and durability for maintaining critical clearances.