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 * Functions include pneumatic seat-height adjustment from 17" to 22-1/2" and 360-degree swivel * Backless stool features a 16" round vinyl-covered seat, 2" dual-wheel casters, and a chrome five-star base