Komatsu rod bearing is a two-piece (top and bottom) band of smooth metal. In the case of driveshaft rod bearings, for example, the top half of the bearing is a semi-circle that is mounted to the undercarriage of the vehicle. The bottom half of the bearing is bolted to the top half once the driveshaft is in place. A pinhole through the top half of the bearing allows lubrication to reach the inside. This permits the shaft to spin within the bearing without generating excessive heat.