This BrassBronze Dragonfly Door Knocker was designed by Michael Healy, an accomplished Rhode Island artisan- He enjoyed studying the acrobatic flight of dragonflies while fly fishing in the pond near his cottage- On one August morning, Michael found a large dragonfly perched on the front door- The dragonfly eventually flew away but left behind a wonderful idea for Michael Healys first door knocker design- It has been signed by Michael Healy to confirm its authenticity- The Dragonfly has been cast in solid brass- Brass and bronze are copperbased alloys- The yellow brass alloy used in many of Michaels designs contains 70 copper and produces a warm, traditional brass look- Red bronze contains almost 85 copper- This additional copper content gives the bronze alloy its rich, reddish undertone- The mirrored finish of polished brass and polished bronze is achieved through varying degrees of sanding and buffing- Michael uses these techniques to highlight or accent the raised areas on a piece-Specifications- Material Brass Bronze- Mounting screw center to center distance 78- Dimensions 6 H x 1-75 W x 8-5 L SKU: MCHD003