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 depthadjustable 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 16??" to 21??". Drafting model includes CK38 height extension kit and adjusts from 24" to 29".