How deep is the engraving?

Ref Numbers Line PM...... 0.15-0.20mm. (0.006-0.008') 0.50-0.60mm. (0.019-0.024') Ref Triangle BM...... 0.20-0.25mm. (0.08-0.010')

What kind of thread is on the BM and PM?

Ref Arrow PM...... BM...... M3.5x0.6mm.

Ref	Numbers	Line
PM......	0.15-0.20mm. (0.006-0.008")	0.50-0.60mm. (0.019-0.024")

Ref	Triangle
BM......	0.20-0.25mm. (0.08-0.010")