I don't know what German S2 carbide steel is, but it should be softer than the Macbook Pro screws I've tried on. The tip of a pentalobe screwdriver is completely "blank" after opening the lid of a Macbook with 10 screws for the first time (see picture). Now I have a completely useless screwdriver. I assume the rest of the set is just as bad. Not worth the money!
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