Straight from Japan, which is considered the pioneer of growing shiitake on logs.
A special drill is designed to make holes in logs very easily. The advantage is that it goes in very quickly and cleans the hole very well, so there is no need to re-clean the hole. You won’t have to worry about the cutting depth anymore, because you have a melted brake.
The size is adapted to the mycelium planting tool 12mm
Video of how the drill works: