I cut a lot of metal. I cut brass, bronze, aluminum, carbon steel, stainless steel and alloy steel. I've been buying Bosch knives at hardware stores for a long time and I change them at least twice a month. Since switching to these blades, I've gone from using two blades a month to two blades a year. They are only the last and last. Where Bosch blades usually break fairly quickly, these just don't break. I can use these blades until the teeth are completely worn out, which takes a very longβ¦