Affordable, sturdily-constructed task chairs are perfect for home, office, or student use. Features include pneumatic height control, polypropylene seat and back shells, a height - and depth-adjustable hinged backrest, dual-wheel casters, and a 22" diameter reinforced nylon base. Seat cushion is 17"w x 16"d x 2" thick. Backrest is 16"w x 12"h. Office model height adjusts from 16½" to 21½". Drafting model includes CK38 height extension kit and adjusts from 24" to 29".