My friend called me because he bought a prefabricated granite countertop but needed to drill holes for it. This product worked well, minimizing both contamination and wear on my diamond hole saws.
Starting to work. Before that, we would have had to bring a store-bought vacuum cleaner into people's homes and still generate a lot of dust. With them there is not only NO dust, but also dirt that can be used as an abrasive to clean the counters.
Works great for drilling granite countertops. I installed a new faucet and had to cut a hole in our granite countertop. After watching some YouTube videos it seemed to work best with a wet drill to keep the drill cool. Used a smaller guard ring and worked great. No problem carving granite and the new kitchen faucet looks amazing. Definitely recommend.