This thing is just a beast that was drilled through an 8 inch cast concrete foundation to test it and it didn't disappoint in the slightest. There were mixed reviews and I think negative ones from inexperienced users or the wrong app. It still looks like new, the price doesn't bite. Keep some water on it to keep it cool, lubricated and dust-free. I used my Bosch Bulldog and it worked. The center drill likes to fall out, I think to drill and tap a thread for an American and set screw.