High-performance, ergonomic task chair features a contoured seat and back with built-in lumbar support as well as a sturdy metal frame. Built-in arms adjust in height from 7" to 9" and in width. Functions include pneumatic seat-height adjustment from 16-1/2" to 19", seat-glide mechanism, 360-degree swivel, tilt, tilt tension and tilt lock. With the seat-glide mechanism, seat cushion travels forward and back and then locks into position. Seat measures 20" wide x 20" deep. The seat depth adjusts 2-1/4" from 16-3/4" to 19". Width between the arms is 18-1/4" to 20-1/4". Back dimensions are 19" wide x 19" high. Five-star base rolls easily on five 2" dual-wheel casters. Weight capacity is 275 lb..