sounded like these blades were exceptional, so I ordered a package.  My experience is that they simply don't cut.  Thought maybe the first one was a factory defect, but worked through all of them and found that NONE of the blades in this pack cut.  Tried them in my battery-powered recip, and in the 110 volt recip -- they don't cut.  The cheap blades that I got at Big Lots cut a LOT faster and more cleanly.  So much for getting what you pay for.