If you need to hand tap a few M3 holes then worry about nothing else. We knock. You can pick up the shavings better. These are very small taps, so you REALLY need to pay attention to chip evacuation, even with soft materials. HSS made in the USA is far superior to anything else, so don't worry about Chinese taps. The difference in price isn't that big, and you'll only hurt yourself if you save.
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