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Flint and Steel is a tool crafted from an iron ingot and flint, primarily used to ignite fires. It can set flammable blocks such as wood, leaves, and wool on fire, and is essential for lighting Nether portals. It also has special uses, such as igniting TNT, setting mobs on fire, and activating candles and campfires. Flint and Steel has limited durability, with each use consuming one durability point. In the Nether, it can be used to relight extinguished portals.