The Mini 1 nail file has the same diamond grit as the file # 1 Flexible file - Fine.
This diamond nail file is designed for natural nails that are fragile, thin, soft, brittle or prone to breaking.
You can file back and forth without damaging the nails.
Size of the Mini 1 nail file in cm: 15.4 x 1.3 in inches: 6 x 0.511
