This genuine JCB 32009203U main bearing set is an OEM replacement part designed for JCB 444 series engines. It features a 0.25mm undersize specification, crucial for crankshaft repair or overhaul. This high-quality bearing set ensures proper engine function and durability across a wide range of JCB agricultural and construction machinery, including 3CX, 4CX backhoe loaders, Loadall telescopic handlers, Fastrac tractors, and various excavators and wheel loaders.