From SlateRoofWarehouse.com: This is a popular tool used for soldering copper roof flashings, flatlock soldered copper roofing or any soldering application in the shop or in the field. This is the biggest handheld electric soldering iron on the market and it's a really nice tool. Filmed by Joseph Jenkins, author of the Slate Roof Bible, 3rd edition (https://www.slateroofwarehouse.com/Sl....