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- 1). Place duct tape over the porcelain. This will prevent the drill from sliding over the surface of the porcelain when you turn it on.
- 2). Measure and mark the duct tape where the holes will be located.
- 3). Place the diamond drill bit or the diamond-edged saw on the drill and cover it with cutting oil.
- 4). Turn on the drill to 100 rpms and slowly and gently push it into the porcelain. If you use too much pressure or drill too quickly, the drill bit will turn red and be ineffective. Do not drill the porcelain at a right angle or you may shatter it.
- 5). Periodically stop drilling the porcelain and dip the bit or the saw in cutting oil.
- 6). When the hole has been made, remove the drill and clean the hole off with a wet cloth.
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