The innovative “Dual-X” design.Smoothly facilitates up to 27 lbs (120 N) even if the load is applied vertically or horizontally.Maintains its smooth and consistent movement even when a moment load occurs.Can be used with a motor drive.Precision performance that passed 500,000 cycle tests.The guide block is preloaded significantly reduce rattling.Multiple guide blocks can be used with a guide rail (rails and blocks ordered separately).Ideal for automated machinery, robotics, medical, analysis or food equipment and kiosks.WARNING: This product can expose you to chromium, nickel, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65WARNINGs.ca.gov.