Class 10 Clean Room/ESD Vinyl Medium Bench Height Chair with Medium Back in Chrome is adjustable from 21.5-29 inches from the top of the seat to the floor and features manual back height and depth adjustments, electro-static dissipating components to ensure proper grounding, chrome adjustable foot ring, and cast-aluminum base with dual-wheel, self-braking non-marring ESD casters suitable for hard floors in electro-static dissipating vinyl.