The Small file —3.5 inches— also known as the travel size, is used on finger nails. This size is for carrying in the purse, handbag, and/or car (of course don’t forget the boat!) This file can also replace the clipper, while both sides can be used for filing. It can be used on natural nails and on any synthetic, gel or acrylic overlays. Once you try this file, it will be hard to go back to flimsy files.