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1. Mark back of the glass tile where you plan to drill a hole. Place the tile on a scrap piece of MDF board with the backside facing up. Align the drill bit with the reference mark and drill a small pilot hole.Flip the tile over.. Take a ball of plumber's putty and knead it into a 1/2-inch-diameter, 10-inch long roll. Join the ends of the putty to make a circle and place it around the area where you will be drilling. Press the circle of putty onto the tile to form a seal. This acts as a temporary dam to hold water while you are drilling.
Make a small indentation in the tile. Drill bits, including hole saws, tend to slip very easily on a smooth ceramic tile. To avoid this, you'll need to make a small indentation in the center of your circle for the drill bit to fit into.The easiest way to do this is by positioning a nail set onto the tile and tapping it gently with a hammer.. Purchase the correct size tile hole saw. A hole saw is a circular cutting tool designed as a drill bit; hole saws are fitted into your electric drill's chuck just like any other bit.