These GLYCO main bearings, part number 71-3869/4 0.25MM, are engineered to provide robust support for your engine's crankshaft. Crafted with high-quality materials, they are built to withstand the demanding conditions within an engine, reducing friction and wear. This ensures the longevity and reliability of your engine's core components. The 0.25MM undersize specification indicates these bearings are intended for crankshafts that have been machined to a slightly smaller diameter, often as part of an engine rebuild or repair process. Proper installation is crucial for achieving the intended clearances and performance benefits. Choosing GLYCO main bearings means opting for a component that contributes to the overall health and efficiency of your vehicle's powertrain. They are a critical element in maintaining proper engine function and preventing costly damage.