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Nails are pointed hard metals (usually steel) used to fix wood and other objects. Hammers drive nails into objects. Recently, there are also electric nail guns and gas nail guns. The reason why a nail can stabilize an object is that it hooks on it by its own deformation and depends on friction. Nails are one of the most common things in decoration. Iron nails are also called iron nails, and steel nails are also called steel nails.