Taps are strong enough.
Personally I used all taps M4, with the aim of tapping threads 300 to a depth of 10mm brawny steel.
Sure to preserve the set I used cutting oil and tapping is only manual (roughing, intermediate, finisher).
Finally, the set M4 laché me after the 50th thread.
But for the price paid and the imposed constraints, I do not think he'll last that long.
Besides, buying a new set M4 is the price of the box.
So pleased with the cabinet, 4 stars instead of 5 because the taps M4 have still cowards.
