The Rockwood 627 is a UL Listed 190 Degree Door Viewer w/ Heavy Duty Privacy Cover,  For Regular and Fire Rated Doors 1 3/8" to 2 1/4", and is made of Brass material.  Rockwood 627 Door Viewer has a Heavy duty privacy cover to prevent visual intrusion from outside of the room. The Rockwood 627 Door Viewer is easily installed by drilling a 9/16" hole.