Adjustable stool has 7⁄8" 18-gauge steel tube frame with Metal Gray finish. 1/2"Diam. masonite board recessed into the pan with eight rivets. Board will not chip or crack. Product meets or exceeds applicable ANSI/BIFMA standards. 151/4" to 171/2"Diam.x25" to 321/2"H. 11 lbs.