Door Knocker. Knock, knock! Once a sign of their homeowner’s profession, doorknockers now come in a variety of designs & finishes for everyone’s style. Step-up your curb appeal & add value to your home with finishing touches like a knocker. Made of 100% solid brass with tarnish-resistant antique-brass finish make this knocker a knock out! Easy installation, thread bolts through the door for secure mounting. Mounting hardware included. Measures: 6 3/4 in.