Cassettes pass box are installed in the wall to permit the tansfer of exposed or unexposed cassettes from the dark room to X-Ray room and return. The cabinet is divided into two compartments. One for exposed cassettes other for unexposed. The doors are located at both the front and rear of each compartment and are controlled by a special interlocking device preventing simultaneous opening. They are completely lead lined for protection against X-Ray. Powder coated body. Available in dimensions 24 x 221/2 x 24 Inch.