This Corner Desktop Riser can turn any 90 degree desk into a sit-to-stand workstation while simultaneously creating more useful table space. It is height adjustable up to 20" above the desk surface and can steadily hold two computer monitors. Three built-in grommets will help clear the space of unwanted cables. The keyboard tray has a 20 degree tilt function that easily adapts to all users. This riser comes fully assembled with a single paddle for effortless raising and lowering. Covered by a 2 year manufacturer warranty!