I use it to make a cut in 0.6mm thick stainless steel. It takes a little hand strength to work, but it works and does exactly what I need it to. I made the mistake of leaning it against my inner thigh to squeeze the handle. That night my wife asked me where the huge bruise on her inner thigh came from. So don't squeeze the inner thigh :-) I only need 10-15 cuts a day. If I had to gnaw on tin a lot I would try to find a better solution or make some sort of thick foam grip to be easier on my hands. But I use stainless steel, which is pretty thick for a tool.