I bought an expensive large ceramic planter that didn't have drainage holes. I ordered this Holesaw to remedy the situation and it worked just fine. I drilled four holes at the bottom with no problem. FYI, in starting the hole you must begin by starting at an angle and easing it to an entire head-on drilling. Also the ceramic gets very hot, stop drilling a few times to pour cold water on the ceramic. The bit must be cooled off also.
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