Genuine OEM Kia Crankshaft Bearing Pair Set, part number 2102004005. These bearings are crucial components that support the crankshaft's rotation within the engine block, minimizing friction and wear. They are installed around the crankshaft journals, allowing for smooth and precise rotational movement. Choosing genuine OEM crankshaft bearings ensures factory-specified tolerances and material composition, critical for maintaining engine balance, reducing vibration, and achieving a long, reliable service life.