Let me rephrase.
Tester approved tool manufacturer that happens to include allen keys in their product range?
Dunno about Tstr, but I read that Bondhus are the most true to size and they're reassuringly expensive: I think I paid £25-odd for a ball-ended set.
@Goyt started
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Let me rephrase.
Tester approved tool manufacturer that happens to include allen keys in their product range?