These Knipex Nibblers are quality tools and they work well. Knipex is known for quality and these nibblers live up to that expectation. They cut easily and practically do not deform the metal edge. I've used them on both 20 and 22 gauge. A small detail - when cutting, pay attention to the position of the hands. The handles have raised sections that allow you to push the tool forward, but if you have leather on those sections you'll feel it as you cut through.