File grit

File grit refers to the coarseness or fineness of a nail file's abrasive surface. It's indicated by a number: the lower the number, the coarser the grit (more abrasive particles per square inch), and the higher the number, the finer the grit (fewer, smaller abrasive particles). For example, an 80-grit file is very coarse, while a 240-grit file is much finer. Understanding file grit is crucial for achieving desired results and maintaining nail health, whether you're a professional or doing your nails at home.