This is an antique decorated brass door knocker.A simple rotating mechanism is attached to the door knocker.You can manually lift the door knocker and hit the door,producing a loud knock on the door to remind people at home / apartment.It is very suitable for entrance doors or garden sheds. parameter: Product name: door knocker Color: brass,bronze Size: 18 * 12cm （7.08 * 4.72in）, Weight: 425g Size: 22 * 14.5cm （8.66 * 5.70in） Weight: 760g Material: brass Door thickness Applicable: 3-3.5cm (1.18-1.37inch) Applicable scenarios: front door,gate,wooden door,garden fence Delivery list: only 1 * swing for door,installation screw * 1 (other products are props) Notice: Due to manual measurement,the product has an error of 1-3cm. Due to the different shooting lights and different monitor resolutions,the product has some color difference.The actual product shall prevail. t us. Welcome to our store,there are many products in the store,you can go to the store to browse,I wish you a happy shopping! We have multiple styles of knockers: front door knocker,clapper earrings,peephole door knocker,bee knocker,lion knocker,brass knocker,bat knocker,cat knocker , ,black clapper,pineapple clapper, ,skull clapper... If you need other styles of clapper,you can browse our store as you like.