Soldering, rework and desoldering irons and handpieces are the primary hand tools used in soldering. Soldering irons consist of a heated metal tip at the end of an insulated handle. The tip is most commonly heated by electrical power, then applied to melt the solder. When the soldering iron is part of a soldering station, the heat is regulated through the station. Soldering irons and handpieces come in a wide variety of sizes and types, from pencil-thin to irons with interchangeable heads. Desoldering irons have a hollow tip equipped with a pump for extracting melted solder.