The numbers indicate how hard a file is.

The higher these numbers are, the finer the texture is, and the lower they are, the coarser and rougher it is. The lower the GRIT, the coarser the surface of the file and vice versa.

• 80 GRIT — Very coarse grains. Used for removing acrylic – gel – acrylic gel. (Caution: if the material is thin, it is better to work with 100/100 GRIT)
• 100 GRIT — Used for shaping the side walls of artificial nails and giving them shape. (Not recommended for shaping the body of the nail, may create deep scratches.
• 180-240 GRIT — Used to shape the natural nail as well as in preparation for acrylic, gel and acrylic gel application.
• 320-600 GRIT — Files are polishing