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"A screw used in ancient machinery. It's made of an unknown material, and no matter how many times it's turned, its threads never seem to show signs of wear."
The Ancient Screw is a material found in Breath of the Wild. They can be obtained by defeating all types of Guardians, which can be found in Shrine of Trials, Hyrule Castle, as well as being scattered in the Overworld. This material can be traded with Kilton, in his shop, the Fang and Bone, for 2 Mon each, but its main purpose is creating ancient equipment at the Akkala Ancient Tech Lab. The Ancient Screw is used in the enhancement of the Ancient Helm, Ancient Cuirass, and the Ancient Greaves.