INSTALLATION Comes with screws for easy installation on any door, no special required. Exposed Wire Protection: Door knocker wires, easy to use, and environmentally friendly, long service life The gooseneck is flexible, so wires can be easily got through it, and for inside won't hurt the wire Door Loop: Our door rings are made of materials. After special for surface treatment they are rust resistant and which can effectively wires or cables from malicious damage or bad weather damage Purchase Notice: We the shopping experiences and satisfaction of each customer, so we provide technical support. If the product install or quality have any problem, please contact us in time.We will solve it as soon as possible.