Prefect Office PartnerThese 2 classic white stand can meet your 3 needs one time: Raise 2 monitors/laptops/printers/game boxs Relieve fatigue Increase storage space. 2 Height Adjustable [3 3/8 & 6 3/4] Ergonomic design. When used side by side, the height is 3 3/8, which can place two monitors. When stacked up and down,be a 2 tier monitor riser which height is 6 3/4, and it is fixed with wooden pins avoid shaking.