Are these the bottle opener type tool, with a bit that looks like a crown punched into it........that takes the lock ring off, whilst propped against the chain stay?......
I had (have?) one, it broke from overuse and was welded back together. I wouldn't use one on a lightweight frame.
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They work really well.....I would also point out that I never overload a lock ring. Pinch tight with normal tools has always been sufficient, in order that removal never needs big spanner loads......the cracker will then do the job with the wheel out of the bike, rag over cassette for purchase and a rubber mallet on the cracker.....