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Knipex pliers wrench is the one for the job. Maintains parallel jaws and clamps while turning.
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I’ve used both and own the pliers wrench, but for pure grip with a small contact area I’d still prefer the alligators/Cobras.
While you can squeeze really well with the pliers wrench, the smooth jaws are still more likely to move around when you’ve only got a small area to grab onto, while the teeth on the cobras really prevent slippage.
Just my 2p tho ;)
I’d have a cautious go with a decent set of grips/dogs/pipe wrenches/channel locks (delete as regionally appropriate).
https://www.amazon.co.uk/Knipex-Cobra-performance-pliers-adjustment/dp/B000X4J2H0/ref=asc_df_B000X4J2H0/?