Prepare the glass drill bits you want, the commonly used ones are from 3MM to 25MM, and they are sold in general hardware stores.
First draw a circle of the size you want with a marker pen on the place where you want to drill. Remember to use a waterproof marker pen, because water is used when drilling glass.
Install the glass drill bit, first let the drill bit form an angle of about 75 degrees with the glass surface, let one side of the drill bit touch the glass first, never put the drill bit perpendicular to the glass, unless your hand is a mechanical arm, otherwise you can’t Hold the drill steady! This is the point!!
Let the drill bit cut along the painted money. It is best to ask another person to help water it. If the water is not watered, the drilled glass will become white. If you block your sight, you will not be able to see the line drawn on the glass. up. After the drill cuts a groove on the glass, lift the drill slowly until it is perpendicular to the glass.