The 2-1/2" dia casters (two locking) allow the workstation to move around the classroom or even from room to room with ease and minimal disruption. Large desk surface is great for laptops and tablets. Included keyboard tray (27"W x 9-1/2"D) adjusts by 4". One person can quickly adjust the desk height from 28-1/2"H up to 45-1/2"H thanks to the single-lever design. Black powder-coated steel frame with laminate top lasts for years. Assembly required. 43 lb. Truck delivery.