When drilling tiles it is vital to have the correct bit to ensure you do not splinter the edges.
Before you start put a piece of masking tape over the are where the hole is required, you can then mark your drilling position on the tape.
Use a triangular tipped drill bit designed for tiles such as the ceramic head ones above to cut through the tile.
When through change to a traditional but to cut through the correct depth to avoid damage to the tile bit.
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