There's no other file like it! This revolutionary nail file has three special filing surfaces. The first surface is located on the sides of the file and is designed to give a clean, smooth edge to the end of the nail. The second and third surfaces are somewhat finer. These surfaces are on the underside of the wide end and the topside of the narrow end of the file. They are specially designed to remove any burrs that may appear on the top or underside of the nail after clipping or filing.