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.