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How to drill a hole in tile using a tile hole saw
Measure the diameter of the hole you need to cut.
The best way to do this is by placing the pipe, faucet, or other fixture directly onto the tile and tracing its outline using a wax pencil. If this is not possible, you can measure the diameter of the fixture using a tape measure.
Note that your cut will likely not need to be perfect, as the trim ring of the fixture will cover the cut edges of the tile. Purchase the correct size tile hole saw.