Complete body made of SS 304 Inner and Outer (20 Gauge). Complete Body made of CNC Machine. Our pass box are essential for the transfer of work item in and out of the clean room in order to minimize air borne particles brought about by human traffic. Our reliable mechanism prevents both pass through door from opening at the same time there by preventing contamination. It have a built in UV germicidal light for extra protection. It has Magnetic door locking system.