The Allsop Ascend Dual Monitor Stands feature two height adjustable platforms that can be mounted and adjusted individually providing maximum flexibility and customization for dual monitor setups. The Ascend stands feature a robust clamp system that is hidden underneath the desk to optimize work space (fits desks up to 2? thick). Each 14? x 9? platform can be adjusted to three height options for best ergonomic positioning (4?, 4.88? and 5.75?). The platforms are the ideal option for monitor stands with traditional base stands (non-VESA) or for raising laptops to the same height as your monitor. The Ascend Monitor Stands create more usable desk space than freestanding monitor stands and offer a sleek modern look. Each platform has a 30 lb capacity.