The durable construction and classic design of the 6300 Series heavy-duty square-seat stools with backrests are ideal for hands-on educational settings like art rooms, science labs, home economics or shop classrooms. These reliable stools feature a strong frame of 18-ga steel tubing securely welded to the seat pan which is riveted in sixteen places to wide Masonite seats that will not warp, chip or crack as they provide years of dependable use. Footrests are securely bonded to each leg with four spotweld contact points. The adjustable backrests can be moved two inches up/down and forward/back.