Lorell  Exec High-Back Swivel Chair, 28-1/2"x28-1/2"x45", Black High-back mesh chair offers a mesh back and seat with plastic-coated steel frame. arms with polyurethane arms pad adjust in height and width. functions include pneumatic seat-height adjustment, seat glide mechanism, 360-degree swivel, tilt tension an D synchronized knee tilt. high-back chair meets the ca117 fire-retardant standard.