The Rockwood 622.STNN brass door viewer has a 190-degree viewing range and a satin nickel plated clear coated finish. It meets American National Standards Institute (ANSI) A156.16 specifications and is UL listed. It can be installed in a 9/16" hole diameter in doors 1-3/8" to 2-1/8" thick.
Door viewers, also called peepholes, consist of a lens and cylinder which is inserted into a door, allowing a view outside. The amount of visibility is determined by the degree of the lens; the higher the number, the greater the visibility. Door viewers are sometimes incorporated with door knockers.
Rockwood Manufacturing Company manufactures door hardware. The company, founded in 1946, is headquartered in Rockwood, PA.