I was very skeptical as they are cheap and made in China. But for the price I thought it was worth a try. I was pleasantly surprised when I had to punch a 1.5 inch hole in a cinder block. Works like a dream! Do not get me wrong. one more sentence. But they will last a while if you take care of them and don't stress them too much. I never thought I would say this, but I recommend them! .I would not buy them for professional use)