This GLYCO main bearing set, part number 01-4200/4 0.30mm, is designed to provide essential support for your engine's crankshaft. Manufactured to exacting standards, these bearings ensure proper alignment and reduce friction, contributing to smoother engine operation and extended component life. The 0.30mm undersize specification indicates these bearings are intended for crankshafts that have been machined to this dimension. This is a common practice during engine rebuilding or repair to restore proper clearances and performance. GLYCO is a recognized name in engine bearing technology, known for producing reliable components that meet or exceed original equipment specifications. Choosing GLYCO ensures you are fitting your engine with quality parts that are built to last. Proper installation of main bearings is critical for engine health. Ensure all surfaces are clean and lubricated according to manufacturer specifications to achieve the best results and prevent premature wear.