Black Polyurethane Tractor Sit-Stand Desk Height Stool in Chrome is adjustable from 17.5-22.5 inches from the top of the seat to the floor and features ergonomic adjustments such as seat height and locking seat tilt and cast-aluminum base with chrome-hooded, dual-wheel, self-braking, non-marring casters suitable for hard floors in chemical, soil, and puncture resistant polyurethane.