Each Flexi-File comes with a different grade on each side, and each type goes from coarse to very smooth.
To create a polished surface, start with the Coarse, move on to Medium and then final on to with Final Finish.
Coarse: (100MX / 150MX – Initial Material Smoothing)
Medium: (180MX / 240MX – Initial Smoothing)
Final Finish: (400MX / 600MX – Final Polish)
Conforms to Nato Stock Number (NSN):