Diamancel is a high-quality and professional nail care brand. I use this file almost daily, as I carry it around in my makeup bag. It is compact and portable. The file itself is coarse enough to remove any imperfections on the nail surface as well as on the tip of the nail. As compared to less expensive alternatives, it is a lot better quality and has lasted me several years.
I would recommend this file to anyone looking for a reliable, good quality nail file. Very good bang for your buck.