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Urn door knockers can be found that are mounted to the door by one of two methods. One method uses screws that pass through the knocker and screw into the door. The other method uses bolts or other hardware that goes entirely through the door. Either method works well on wooden doors but the through the door method works best on other doors. It seems that I have answered my own question. The urn door knocker is popular for many good reasons the least of which is that they really look great on the entrance way to a home. The selection of a door knocker may be a bit more difficult than you imagine.
The finish should match the rest of the hardware. Door knockers not only come in many finishes they are available in many types of metal. The most stable metal and probably the most common is brass. Brass is easy to machine and cast into shapes. It polishes into a bright gold like finish or satins easily and is easy to maintain. Brass also electroplates readily. This allows it to be nickel or copper plated to simulate pewter and bronze finishes. Because brass is non ferrous it will not rust. It will tarnish though for this reason a good lacquer finish is needed or your purchase will look terrible in a very short time.
Pay close attention to what the door knocker is made of. Some manufacturers get away with making low quality zinc or pot metal castings look good for a short time using plating techniques. The problem with these is the good looks do not last. Soon the plating is chipping and pealing away and corrosion is taking over. What type of mounting is needed? Most door knockers employ either through the door mounting or surface mounting. Through the door mounting involves drilling holes through the door. The mounting hardware passes through these holes and attaches to the door knocker on the outside. On the inside decorative nuts are used to secure the door knocker to the door. Surface mounting uses screws to attach the door knocker to the door.