The numbers indicate how hard a file is.

The larger these numbers are, the finer the texture is, and conversely, the smaller they are, the thicker and rougher they are. The fewer the GRITs, the coarser the surface of the file and vice versa.

• 80 GRIT — Very coarse grit. Used to remove acrylic – gel – acrylic gel. (attention: if the material is thin, it is better to work with 100/100 GRIT)
• 100 GRIT — Used to shape artificial sidewalls and shape them. (not recommended for shaping the body of the nail, it might create deep cracks.
• 180-240 GRIT — Used to shape the natural nail as well as in preparation for acrylic, gel and acrylic application.
• 320-600 GRIT — Files are polished