Mount-It! Standing Desk Converter 48″ Wide Sit Stand Extra Large Desk Riser

From the brand

Turn any desk into a sit-stand workstation: Set it on the desk you already own and switch between sitting and standing all day. The extra-large 48.5″ x 23.25″ top fits two monitors, a laptop, and your essentials.
Room for your monitors, 33 lb capacity: Fits two screens, or up to three smaller ones, plus a built-in slot for your phone or tablet. Weight is the limit, not space: keep the load within 33 lbs for the smoothest lift.
Adjusts from 6″ to 19.25″: Gas spring handles glide the platform to any height and lock it there, so you get a comfortable eye level seated or standing and less back and neck strain.
Two gas springs share the lift: A manual, no-electricity design with dual pistons for controlled raising and a secure hold at any height.
Sturdy steel with a keyboard tray: A reinforced steel frame keeps screens steady, while the lower keyboard tray and device slot keep your desk tidy.
Ready in minutes: Ships almost fully assembled. Just attach the keyboard tray and set it on your desk. Instructions included.
Backed for life: Supported by a US-based team and a lifetime warranty, so help and replacement parts are always within reach.