Carbide tipped masonry bit
Drilling holes up to about 1/2 in. dia. through glazed ceramic tile is easy to do with a carbide-tipped masonry bit. But what if you need to bore a 2-in.-dia. hole for a plumbing stubout? Contractors typically use expensive hole saws, which have carbide-grit cutting edges. But there is another way to make those wider openings.
Draw the hole outline on the tile with a felt-tip pen or grease pencil. Use a 1/4-in.-dia. masonry bit to drill a series of closely spaced holes around the circle. Then take a hammer and very lightly tap the tile along the ring of holes.
Tap inside the outline and be patient. It could take a couple of minutes before the center of the hole breaks free. The edge of the hole will be rough, but you can hide it with a decorative escutcheon plate. This drill-and-tap technique can also be used to make square or rectangular cutouts in tile.