Safco Medina Extended Height Office Chair - 18" (457.20 mm) x 18" (457.20 mm)33" (838.20 mm) Seat, 18" (457.20 mm)16" (406.40 mm) Back, 28" (711.20 mm) x 28" (711.20 mm)48" (1219.20 mm) Chair - Finish: Brushed Aluminum, Black