Small bits work best for creating a dimple or starter hole in the glass.
How to drill hole in glass shower door.
Insert a 1 8 inch or 3 32 inch carbide or diamond tipped bit into the chuck of a variable speed drill.
Drill the hole through.
Double check the speed of the drill.
Yes the tempered glass will completely shatter if this is even attempted.
Then placing a hard wood behind the glass you must use the stylus very gently tapping with a hammer.
Tape a small scrap of dense cardboard to the glass.
Buffer the area between the glass and the clamp with the rubber.
Use the mandrel on your drill to create the first hole in the glass.
Clamp the glass down with the c clamps.
After a long time you can drill a hole.
But if you can use a steel needle or stylus absolutely thin and spikes you can.
Position the glass under the drill or position the drill on the glass where you want to drill.
Begin at very low rpm to create a dimple in the glass then remove the cardboard and continue at about 400 rpm.
Place the point of the drill at the center of the marked point on the glass pour a few drops of lubricating oil on the area around the drill tip and glass beginning at low speed with medium pressure drill a small starter hole into the glass.
Drilling a hole in a pane of glass or a mirror is simple.
Then put the saw on the drill and place it into the hole you created with the mandrel.
In this video we drill a hole using a spear shaped glass drill bit.