2.5" hole saw recommendation

[turnhard]

Electrician knockouts or slugbusters are super clean round cuts. A 2 inch conduit knockout is actually 2 3/8. They last forever when not abused. Kevin

[BANKO]

I was fortunate that in this instance of using a hole saw in thin sheetmetal, I got clean round holes where my vintage air swivel vents needed to go. I was out of time and couldn't find these great tools locally, however they'll be one of the next tool purchases I make.