Class 100 clean room gray polyurethane medium bench height chair with medium back in chrome is adjustable from 20.25-28 inches from the top of the seat to the floor and features ergonomic adjustments including seat height and locking back tilt, chrome adjustable foot ring, 6-way adjustable armrests, 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.