1″ diameter, S-style all -welded frame. Adjustable height range: 18″ – 24.5″. Solid steel, machined thread screw adjusts height by rotation of the stool cushion. 14″ diameter seat cushion; 4″ thick (black) firm polyfoam padding. Premium, stain resistant woven knit backed binyl upholstery. Round foot ring. 2″ rubber wheel, ball bearing casters. 19.5″ diameter base. 250 lb weight capacity under normal use.