Polyurethane ESD Tractor Sit-Stand Medium Bench Height Stool in Chrome is adjustable from 21-29 inches from the top of the seat to the floor and features electro-static dissipating components to ensure proper grounding with ergonomic adjustments such as seat height and locking seat tilt, optional chrome adjustable foot ring, and cast-aluminum base with dual-wheel, self-braking, non-marring ESD casters OR stationary, non-marring ESD glides suitable for hard floors in chemical, soil, and puncture resistant polyurethane.