Sturdy 0.87' 18-gauge steel tubing. Seat is a full 14' diameter with 1.5' diameter masonite board recessed into the pan with eight rivets and will not chip or crack. Foot rings, with a 0.62' outer diameter are welded to each leg by four contact points for added rigidity. Features height adjustable legs. Tested by Bureau Veritas to support 500 lbs static load capacity.