Door knocker and visionary, 12 cm high knocker, 180-degree viewing hole, 9/16 inch bore, for doors 1-3/8" to 1-7/8" thick, brushed nickel

The spectator knocker is used on the front door to provide privacy when viewed from inside the house, or as a decorative knocker for visitors. The 180-degree mounting hole requires a 9/16" (14mm) diameter mounting hole. Very easy to fix. The knocker can be installed from 1-3/8" to 1-7/8" (35-47mm) thick doors. The door knocker is a durable zinc alloy construction with a brushed nickel finish. The door knocker is a durable die-cast zinc alloy construction with a matte black finish. The design is elegant and simple, and can be well suited to all kinds of doors such as PVC doors, wooden doors, and steel doors.