A nail file is a tool used to gently grind down and shape the edges of nails. They are often used in manicures and pedicures after the nail has been trimmed using appropriate nail clippers. Nail files may either be emery boards, ceramic, glass, crystal, plain metal files or metal files coated with corundum (sapphire). ==Materials== ===Emery board=...
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http://en.wikipedia.org/wiki/Nail_file
a small file of metal or cardboard, for trimming, smoothing, or shaping the fingernails and sometimes having a point for removing dirt from under them.
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https://www.infoplease.com/dictionary/nail-file
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