I have the air shears that Ned shows in his post -- mine rarely get used - they're almost useless unless you have a nice flat clean sheet of metal to work with -- they don't like stuff that's contoured or dirty - or too thick... and they get stuck a lot if you're trying to "push" them through a cut. They also use HUGE amounts of air... so you'd need a big azz compressor.
They're handy when you need 'em though!!
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