I had to drill about 25 holes in our concrete pool mat to install the new cover. I first bought a Bosch and was very disappointed. They could be drilled, but the 1 5/8 inch (3/4 inch diameter) hole took several minutes. I read someone else said that Dewalt works better than Bosch so I ordered this one and it definitely cuts about twice as fast. I did the last 18 or so with Dewalt and the last hole went just as well as the first. I still prefer Bosch to Dewalt for all saws.