The Rockwood 614V.26D cast brass door knocker has a built-in door viewer and a satin chrome plated finish (Rockwood/BHSM number US26D/626). There is a space for engraving a name or number. The knocker with viewer meets American National Standards Institute (ANSI) A156.16: L03161 specifications. It measures 3" high x 2-1/8" wide x 0.45" thick, and it includes two #8-32 x 2" flathead machine screws and two #8 finish washers for attaching the knocker to standard 1-3/4" thick doors.
A door knocker is a metal plate with a metal ring or hammer that attaches to the outside of a door to facilitate knocking. A door viewer, commonly called a peephole, consists of a metal cylinder and a glass lens. It is inserted in a hole in a door to allow one to see out of the closed door while preventing those outside from seeing in.
Rockwood Manufacturing Company manufactures door hardware. The company, founded in 1946, is headquartered in Rockwood, PA.