Top platform measures 18w x 14d, adjusts from 41-1/2" to 47-1/2" high. Middle platform measures 18w x 16-1/2d, extends 4" for easy access to laptop. Lower wrap-lock stability panel provides convenient storage for supplies and accessories. 3" casters, two locking. 18w x 20d. Shpg. wt. 38 lbs. Assembly required.