Made of 7⁄8" O.D., 18-gauge steel tubing in 3 fixed and 3 adjustable sizes with an optional backrest. The seat is a full 14" diameter with an 11 ½" diameter masonite board recessed into the pan and will not chip or crack. Footrings, 5⁄8" O.D., are welded to each leg, with 4 contact points at each leg for added rigidity. The optional backrest is 6" high and 12" wide and adjusts up/down and forward/back.