I use a 20LPI, 75 Degree tool for Luger grips. Checkering tools come in 60 deg, 75 deg, and 90 deg angles to the sides of the cutter. Most American checkering is 90 deg, most European is supposed to be 60 deg, but 75 deg is the closest to that found on 95 % of Luger grips.
I occasionally run across Luger grips that are 18 LPI.
It seems that most Luger grips, except for early ones, are not uniform in the line spacing, and tend to widen as they near the edges of the grips.
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