The Cat 3577890 is a genuine Caterpillar shim designed for accurate spacing and adjustment within various Cat heavy equipment. This precision-engineered component ensures proper alignment and reduces wear in critical assemblies, contributing to the longevity and optimal performance of your machinery. With an outer diameter of 101.6 mm, an inner diameter of 76.2 mm, and a thickness of 0.25 mm, this shim is a vital part for maintaining specified tolerances.