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Nails are generally made of plain steel. It is of interest to note that steel used for nails is uncoated steel. Practically, nails are sharpened metal pins driven into wood with a hammer or a mechanical nail gun. There exist different types of nails. Among them common nails and finish nails are the two types most frequently used for fastening. Common nails have flat heads and are used for most structural connections in light framing constructions. The main property of finish nails is that they are headless. Finish nails are used to fasten finish wood work.