I have a question about nut slot heights

The gauge comes equipped with the 3 most common nut height sizes plus 3 additional sizes to accommodate

Actually the best way to think of the nut slot depth is in relationship to the string action height at the first fret and 12th fret Most

nut slot files 021” when initially shaping the nut by measuring the first fret height, adding 021” to that, and stacking flexible feeler gauges up to that

nut slot height Ideally, the nut slot height is identical to any other fret But remember that strings can 'saw' themselves through a nut just through normal use I