This is a new door knocker and viewer product from PRIMELINE TOOLS. It is made of cast brass and has a satin nickel finish. The total height of the product is 5-1/2 inches and it has a 180-degree view. It is designed to install on 1-3/8 inch to 1-3/4 inch thick doors and requires a 9/16 inch outside diameter hole for installation. It can be used as a decorative door knocker for visitors while also increasing the security and privacy of your home. The product comes with a 1-year manufacturer warranty.