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. If you are stripping the most common types of electrical wire there are many effective ways and a simple pair of side cutters can get you a long way.
Had to be shown how to do it properly and I've never looked back. I'll try and explain but probably fail.
For right handers:
Hold wire with left hand as if you were clasping a pipe and pointing your thumb like you're giving a thumbs up- IE, fingers making a fist round the wire and thumb pointing in the direction of the wire. Have cutters/pliers in your right hand, close cutters on to the insulation but don't squeeze hard. With your pliers' cutter gripped onto the insulation, push the pliers with your left thumb where the pliers hinge, you can also lever the pliers by pivoting them on your left thumb for extra leverage. With this method you'll get a lot of force to pull the insulation off, which makes it easier to not put too much pressure onto the cutters and accidentally cutting into the copper.
This one?
https://www.amazon.co.uk/Knipex-12-62-180-SB/dp/B000C74WBO
I've had a few adjustable ones in the past but they were never great. Would be willing to pay for one that consistently worked.