Pond Boss Forums POND CONSTRUCTION Creating habitat Manufactured structure questions

IMO I would be tempted to try a hole saw bit for the largest holes. If getting the plug out of the bit is a problem, I would drill a small hole first to have a way to get a hold of the plug to pull it out of the bit. FWIW I think a stepped bit (unibit) would probably work but will be dang expensive at a 2 inch size.