Classic solid brass wide angle door viewer for added security while opening the door. The 170 degree viewing allows for wider viewing area over standard viewers. Optical lense set in solid brass. For use on doors 1-3/8 to 2-1/4 inches thick. Requires drilling a 9/16 inch hole for installation. Offers 170 degree lens angle for wide viewing. Includes precision-ground glass lenses. Fits doors 1-3/8 inch to 1-3/4 inches thick. Requires 9/16 inch hole. Polished solid brass housing.