What is the height of the shelves from the existing desk or table-top?
For the Standard Desk, the keyboard shelf has a range of 4-14in above the existing surface, and the monitor shelf has a range of 14-25in above the surface.
For the Tall Desk, the keyboard shelf has a range of 10-20in above the existing surface, and the monitor shelf has a range of 20-31in above the surface.
For all desks, shelf slots are positioned every 1.75in.
To ensure that you have the proper fit, please refer to this illustration:
