CRL's Thru-Glass Gunport is designed to be mounted into bullet resistant glazing 1-7/8" to 2" (48 to 51 mm) thick. Custom spacer rings available for thinner glazing. Typical applications include correctional institutions, and other areas where ballistic protection and hand gun response may be required. Gunports are shipped with all parts included for field installation. A 6-1/2" (165 mm) diameter round cut-out is required in the bullet resistant glazing in the desired location. The Gunport is fabricated from stainless steel plate, and arrives fully assembled, supplied with gaskets and mounting screws. Custom sizes available upon request.