Door Knocker. Knock, knock! Once a sign of their homeowner's profession, doorknockers now come in a variety of designs and finishes for everyone's style. Step-up your curb appeal and add value to your home with finishing touches like a knocker. Made of 100% solid brass these knockers are a knock out! Polished and lacquered to prevent tarnishing this knocker is both beautiful and functional. Easy installation, thread bolts through the door for secure mounting. Mounting hardware included. Measures: 7 in. H x 4 in. W.