Quote:
Originally Posted by oldskewel
... This set is similar to the set in post #28 by wpoll, but this one is purposely undersized, with helical cutting edges so it really locks into the bolt you're trying to remove. Damaging and probably destroying it, but gripping really well.
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Those look very like the ones I posted.
I posted the specific set in the image as they are available locally to the OP, in Australia.