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if you zoom in on the picture, you will see that there is a little "trough" or "valley" all along both sides of the blade.......this is the secret......
that little trough "bevels" the nail as you file.....so where normal nail files, file the nail "flat" from top to bottom......this one actually "curves" the nail from top to bottom so that it is totally smooth (in any plane)..........
I enjoy using a product that is well thought out. This simple tool is one such item. After my first use my nails look and feel clean. The lines in the file make the difference. If you are looking for a good way of taking care of those ugly nails then this is your tool.