I found that the key to using my granite slab was to use it on a drill press at high speed and have a second person spray water with a nozzle to cool it down. At first I went relatively slow at the speed of the drill and wasn't happy, then I switched to high speed and the bit went right through the plate. You probably wouldn't buy a few if you were a pro, but for personal use every few years it's great! I used it for a single hole faucet.
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