Features: HEIGHT ADJUSTABLE: Overall height is adjustable with four height settings available. You can choose an ideal height to prevent poor standing posture! But once the height is selected, it cannot be changed without unscrewing bolts. Overall height from ground to top is 23.6'' – 42.1''. TRAY ADJUSATBLE: Space between trays are adjustable with predrilled holes. You can find a fitting height to put computer tower at the bottom. Every tray can hold up to 99lb ( except keyboard shelf ). ROLLING WHEELS: Big swivel casters ( 3.9'' diameter ) make it easy to travel from classroom to classroom. Teacher can put all needs in this presentation cart, such as laptop, mouse, projector and speaker. Two out of four wheels is lockable. PULL OUT TRAY: Retractable keyboard tray is height adjustable ( four height settings ). It is 20'' wide 16.9'' deep when fully pull out. Top surface is covered by a removable rubber mat SOLID CONSTRUCTION: Made of sturdy solid steel, the presentation cart is great for used in office, conference room and library. Assembly is easy under clear instruction. It is 41lb. Specification: Item Weight: 41 pounds Product Dimensions: 23.6 x 17.7 x 42.1 inches Material Type: Steel