Used on entry doors to provide privacy while viewing from inside the home, and also as a decorative door knocker for visitors Requires a 9/16 inch diameter installation hole, designed to install on 1-3/8 inch to 1-3/4 inch thick doors, and has a total height of 5-1/2 in Antique brass finish Diecast construction Please refer to the line art drawing for dimensions and compare with your needs before ordering