The John Deere R138338 is a genuine OEM shim designed for accurate spacing and clearance adjustment within various John Deere agricultural and construction equipment. Manufactured to exacting standards, this shim ensures optimal component alignment and performance, contributing to the longevity and efficiency of your machinery. It features an outer diameter of 44.5 mm, an inner diameter of 31.8 mm, and a thickness of 1.5 mm, making it ideal for maintaining specific tolerances in transmissions, axles, and other critical assemblies.