Lorell LLR69513 Pneumatic Height Stools, 24" x 24" x 23", Black Functions include pneumatic seat-height adjustment from 17" to 22-1/2" and 360-degree swivel Height adjusts easily in a 5" range with a lever under the seat Backless stool features a 16" round vinyl-covered seat, 2" dual-wheel casters, and a chrome five-star base Functions include pneumatic seat-height adjustment from 17-inch to 22-1/2-inch and 360-degree swivel Height adjusts easily in a 5" range with a lever under the seat Backless stool features a 16" round vinyl-covered seat, 2" dual-wheel casters and a chrome five-star base