Unbranded Door Knocker with 180 Degree Viewer, Polished Brass, 5-1/4-in Length, Sold Each

Used on entry doors to provide privacy while viewing from inside the home, and also as a decorative door knocker for visitors. Requires 9/16-in diameter bore hole for viewer, installs on 1-3/8-in to 1-3/4-in thick doors. Diecast construction, polished brass finish. Installation fasteners included. Manufacturer part number MP4234.