In the LM roller, contoured rollers assembled on the circumference of the precision-ground, rigid raceway base travel in infinite circulation while being held by a cage. A center guide integrated with the raceway base is formed in the central part of the loaded area of the raceway base to constantly correct skewing of the rollers. This unique structure ensures smooth rolling motion. The LM Roller is used in applications such as the XYZ guide of NC machine tools, precision press ram guides, press die changers, and heavy-load transfer systems.