Provides convenient passage for specimen from patient area to laboratory. Mounts in walls 3-10″ thick with adjustable flange. type 304 stainless steel, satin finish. ADA compliant interlocking mechanism prevents both doors from being open at the same time; provides sight barrier. Removable stainless steel spillage tray. Rough Wall Opening 12-3/8″ W 12-3/8″ H (3/4 x 3/4mm)