The durable design of the 18" Heavy Duty Steel Lab Stool - Set of 5 makes this a must have seat for the garage or workshop. The seat is designed to stand up to wear and tear.Have a seat and get to work. This Heavy Duty Steel Lab Stool is made of 7/8" 18 gauge steel tubing. Sturdy and durable. The seat is a full 14" diameter with an 11 1/2" diameter masonite board recessed into the seatpan (will not chip or crack). 5/8" footrings are welded to each leg, with 4 contact points at each leg for added rigidity. ANSI BIFMA approved. Sold as a set of 5. Leg Height Adjusters available in a set of 4.