This GLYCO main bearing set, part number 71-4066/4 0.25mm, is engineered to provide superior support for your engine's crankshaft. Crafted with precision, these bearings ensure reduced friction and wear, contributing to a longer engine lifespan and smoother operation. The 0.25mm undersize is crucial for applications requiring specific crankshaft journal adjustments. GLYCO is a trusted name in engine components, known for its commitment to quality and reliability. Installing this main bearing set will help maintain the integrity of your engine's rotating assembly.