There are special appear point drill bits for boring holes in glass. You will need to use a handheld bit brace or a power drill set to run at a low speed.

• Mark the position for the hole, no closer than 1 inch to the edge of the glass, using a felt tipped pen.
• When drilling mirrored glass, mark the back, coated surface.
• Place the tip of the drill bit at the center of the mark and, with light pressure, twist it back and forth until it grinds a small recess and no longer skids over the glass.
• Use glazing putty to form a small ring around the work area, and fill the inner well with kerosene as a lubricant.
• Run the drill at a steady speed and light pressure, since too much pressure may break the glass.
• When the tip of the bit emerges, turn over the glass and drill from the other side.
• Drilling straight through from one-side risks chipping out the back surface.
• Always run drill in lubricant to reduce friction.