NPS 6224H 24" Adjustable Height Steel Stool, Black 7/8O.D. 18-gauge steel tubing Foot rings, 5/8 o.D. Are welded to each leg by 4 contact points at each leg for added rigidity Seat is a full 14 diameter with 11 1/2 diameter masonite board recessed into the pan with 8 rivets and will not chip or crack Height adjustable legs; adjust in 1 increments up to eight additional inches Adjustable height stools feature self-leveling steel glides