I need to drill through Hardieplank cement fiber board for a 1” PVC irrigation pipe.
Common bi-metal hole saws will be dulled from even a single hole and likely wouldn’t even complete the hole. Carbide or diamond hole saw would work but aren’t readily available in the size I need to fit the 1” elbow (which of course is bigger than the 1” pipe alone).
I’m sure the use of 2 bi-metal hole saws would get the job done but is just wasteful as they would be dull afterwards. Just looking for other ideas.