This track-mounted monitor holder is applied to increasing mobility for monitor arms. This holder features easy installation on most monitor mounts with standard VESA plates (75mm x 75mm/100mm x 100mm). With a track on the mount, a monitor has extra 15cm mobility to go up and down. The toothed track keeps the adjustment smooth and stable. Tested by our professional load-bearing experiment, the mount carries a 8kg monitor in maximum, while maintaining reliable mobility. XMA-02 is a perfect option to add more adjustability to an existing monitor mount. Last but not least, before using this accessory, please make sure that the VESA plate will not be rotated in any conditions.