The drill bit will drift across the surface unless encouraged to stay in the one spot using one of the following methods. You can make a starter indentation for the drill bit using a hard tip hole boring tool. Alternatively, stick a small piece of masking tape onto the tile where you need the hole. Then position the diamond tip drill bit correctly and using the lowest speed bore a hole. Tip: tape a makeshift cardboard tray under the point where you will drill to catch the dust.