Hair Line 100/180 Grit Nail Files for Acrylic Nails and Natural Nails 100/180 grit nail files are suitable for different kinds and sizes of nail tips, shape the nails to your desired length and shape180 grit -use to contour the whole nail; to prep natural nail before applying any product and also during a manicure to shorten or shape natural free edge(the side where the logo and grit number (100/180) are displayed on the nail file）100 grit - use to take the length down and to shape side walls and free edge （ the other side of the nail file that is blank）80 grit - Coarsest grit, ideal for shaping acrylic and taking the length or surface down quicklyThe edges will not cut the skin and they are comfortable holding while filing your nails.Hair Line 80/100/180. Works great with acrylic, poly gel, hard gel and dip power nails. Nail files 100/180 grit are made with quality sandpaper, ECO sponges, and strong emery board materials These nail files and buffers are great for filing nails before nail treatment & nail extension These professional acrylic nail files can be used on your toenails 80 Grit Coarsest grit, ideal for shaping acrylic and taking the length or surface down quickly. 100 Grit Coarse grit, ideal for shaping acrylic and taking the length or surface down quickly. 120 Grit Coarse grit, ideal for shaping acrylic and taking the length or surface down quickly. 150 Grit Medium grit, ideal for removing a dip or gel manicure, contour the whole nail and shape natural free edge. 180 Grit Medium grit, ideal for removing a dip or gel manicure, contour the whole nail and shape natural free edge. 240 Grit Fine grit, ideal for smoothing artificial nails and shaping artificial and natural nails before apply nail polish. 320 Grit Fine grit, ideal for refines scratches, smooths and removes imperfections natural nails. 400 Grit Finest grit, ideal for refines scratches, smooths and removes imperfections thin natural nails. Tips: Natural nails require a finer grit. (180 is the minimum) Fine grit is gentle and easy on the nails and the nail beds. On the other hand, artificial nails; such as acrylic, gel, or silk require a courser grit on a file. (80 to 180 grit) How to File Your Nails? Start with dry nails that have been cut to the approximate length. Hold the nail file flat, as filing at an angle can thin your nail and weaken the edge, making it prone to bending or breakages. Filing in one direction is preferable, though if you’re gentle with it, you can file side by side. File from the side of the nail to the center, half a nail at a time, then shape the other side. (Filing your nails back and forth will lead to breakage, tearing, and rugged edges) Tips: Natural nails require a finer grit. (180 is the minimum) Fine grit is gentle and easy on the nails and the nail beds. On the other hand, artificial nails; such as acrylic, gel, or silk require a courser grit on a file. (80 to 180 grit) How to File Your Nails? Start with dry nails that have been cut to the approximate length. Hold the nail file flat, as filing at an angle can thin your nail and weaken the edge, making it prone to bending or breakages. Filing in one direction is preferable, though if you’re gentle with it, you can file side by side. File from the side of the nail to the center, half a nail at a time, then shape the other side. (Filing your nails back and forth will lead to breakage, tearing, and rugged edges)