Iron Bars are the refined form of Iron Ore, requiring 3 per bar. Iron is the third tier of materials available, better than Tin, but worse than Lead. A standard Furnace or higher is needed to craft them and an iron anvil to craft items with it. It is the most useful ore in the game because it can craft many things other than armor and tools. It is the counterpart of Lead Bars, in worlds where Iron replaces Lead Ore.