A great accessory for your print room. Plate size 13.8" x 12.6" and has open sides so you can place even wider laptops. Using the height adjustment knob you can set the height between 30 inch to 55 inches to your comfort. In addition, you can set the angle using the adjustment knob. Made of strong steel construction, with a unique bolt system, peg and chain to hold sturdily in place.