Verkkoyou can do this by periodically dipping the drill bit in cold water or using a coolant while drilling.
Drill at a slow speed.
Place one hole in the center, and if more than one is necessary, take care to evenly space them around.
Verkkoplacing holes on the sides of a plant pot improves both water drainage and aeration in plants.
The number of holes should be between 4 to 8, at 1″ diameter per hole,.