The SFD035 Series classroom desks consist of a self supporting frame of 1 1/4" tubular chromed steel MIG welded to the Clearview Compartment. The leg inserts are threaded 1 1/16" 16-gauge tubular swaged chromed-steel with dual high-quality 3/4" x 1/4" bolt attachments. One adjustable and three self-leveling rubber cushioned glides are available in nylon.