Provides convenient passage for specimen from patient area to laboratory. Mounts in walls 3″ to 5 3/4″ (75-145mm) thick. Type 304 stainless steel, satin finish. Self-closing doors. Interlocking mechanism prevents both doors from being open at the same time; provides sight barrier. Removable stainless steel tray. Rough Wall Opening: 11 1/2″ W, 10 7/8″ H (290 x 275mm); 3″ to 5 3/4″ (75-145mm) thick.