This thing sinks drill bits in concrete like it was going through sand. Not cheap poured stuff I'm talking proper poured, cured and aged concrete. I wasted 30 min using water to keep my bit cool with my old hammer drill to tap 2 holes 2" deep. I then sunk 4 holes a full 1" deeper in 5 minutes with this tool and the bit did NOT have time to overheat. Wow really enjoyed using this tool. It pounded the concrete not me. If you are like me, need a hammer drill and don't want to spend 4 x the price for a capable tool then invest a little money in this tool. You will be glad you did.