I am very satisfied with this product. I bought this to make my workspace more ergonomic when I was developing carpal tunnel syndrome and needed to make some adjustments to my computer setup. The setup corrected the ergonomic geometry/keyboard-hands-elbows-shoulders relationship as recommended. And the total cost for it was only $20 (including shelf/tray). The product came much earlier than expected. I attached the rails to the underside of the tabletop that is my desk. Like others, I bought an inexpensive 10 inch deep prefab shelf at my local lumber store ($5). Installing the hardware and shelf/tray was easy. Please note that I could not adjust the height. A screw (on the keyboard slide that would have been used to adjust) held the paint in place. But that wasn't a problem. The height suits me. If it was a little lower I would have issues with the hip tray, and if it were higher the ergonomic angles wouldn't be as good (top of 5/8" shelf/tray is 2-1/2" below bottom 24 -1/8" to bottom of keyboard tray, 24-3/4" to top of keyboard tray, 27-1/4" to bottom of rack/desk, 28-3/4" to top of frame/table).
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