With a contemporary look and ergonomic design, this chair is an ideal choice for any office or drafting environment. The height adjustable backrest features a tightly stretched silver mesh backing and ergonomically contoured design to provide good lumbar support. Pneumatic height control lets users raise and lower height chair height quickly. Multiple controls for adjusting back rest tilt independently or in synchronization with seat tilt. Includes dual wheel casters and a 26" diameter polished aluminum base. Backrest is 19-1/2"w x 19-1/2"h. Seat cushion features long-lasting molded foam and is 19-1/2w x 18"d x 3" thick. Drafting Height is adjustable from 24-1/2" to 28 1/2".