DetailsThe Diamancel number 1 is for weak and brittle nails and as a finishing file. It has fine fine, 220 grit texture. It has a fiberglass base that is both resistant and flexible making it easier and more comfortable to file. Like other Diamancel files, it is also washable and sanitizable. Each Flexible Diamond Nail File in the Diamancel family has been designed for specific nail types to beautifully shape and enhance both natural and sculptured nails.