The compartmentalized tool tray attaches directly to any drawing board. It not only extends the useful space of your board, but organizes tools, pens, markers, clips and other small items. Convenient and easy to get at, it is fabricated out of heavy gauge plastic and includes a humidifying device for keeping technical pens upright and moist while you’re working. Efficient, practical and inexpensive. 31-1/2 x 6-3/8">