I've been a fan of the Klenk scissors since 1990. In fact, I just ordered a new pair of green handle shears because the recoil spring on my 1990's broke. I couldn't find a new replacement spring and looked frustrated so I just ordered a new pair. My 1990's shears (right, left and center scrapers) still work and cut like new, only one spring has failed. Not bad after 27 years of using my HVAC business. Of course, I've never abused them by trying to cut too much sheet metal. The firebox (for "rewind") would be cut out as normal. I suspect a longer grip 10-12 inch pair would be less tiring on the hands but I haven't tried them yet. I would definitely recommend Klenk and not Wiss or any other brand. Brother (1990).