Review on DAMO Diamond Cutting Tools for Concrete, Granite, and Marble by Leslie Matlak

Based on the reviews I bought this racket and am glad I did. I only had to drill a 1/2" hole in my desk to install the articulating arm for my monitor. He got the job done cleanly and easily. Since I only drilled one hole we didn't use water and the tool seems to be quite hot. but it did the job perfectly and took less than 10 minutes with a 28v cordless grinder. If you plan on drilling more than one hole I would recommend using water to keep the drill bit cool. I was a little apprehensive about drilling that 1-1/4" hard stuff, but this tool made it easy.