Reporting question for Fret File - Diamond, offset, for dressing and shaping frets

Product:
Fret File - Diamond, offset, for dressing and shaping frets

Question:
What do the numbers 150 and 300 refer to?

Answer:
These numbers refer to the respective grit of the files. 150 is a coarse grit while 300 is a fine grit. You will want to choose the appropriate grit for your application.