Review on Diamond Arbors Coated Drilling Cutting by Sam Lund

Well this was used for two holes in a faux marble vanity top for sinks. Worked great. Used it to cut 3/4 pine rebar and a Dewalt 20V drill bit for marble. No problem, took my time, used the hose in the driveway to cool and clear debris every 20-30 seconds after cutting. Cutting took 2-3 minutes. There is no visible drill wear. Not sure if it needed refrigeration at all, but I'm glad I did. If this is similar to your project, highly recommended.