Lorell Pneumatic Height Stools with Back, 24 by 24 by 36-Inch, Black Functions include pneumatic seat-height adjustment from 17-1/2" to 22-3/4", back-height adjustment, seat-depth adjustment and 360-degree swivel Back measures 16" wide x 10" high Pneumatic height stool with back features a 16" round vinyl covered seat, dual-wheel casters, and a chrome base Functions include pneumatic seat-height adjustment from 17-1/2-inch to 22-3/4-inch , back-height adjustment, seat-depth adjustment and 360-degree swivel Back measures 16" wide x 10" high Pneumatic height stool with back features a 16" round vinyl covered seat, dual-wheel casters and a chrome base