What size hole for 1.5" bulkhead?

[DgenR8]

Hey, I don't have the bulkhead yet, but I just refound this site for really cheap diamond coated hole saws and I want to order while it's in my head.
So, for a 1.5" bulkhead, what size hole saw do I need?

 

[qy7400]

1 1/2" bulkhead is normally a 2 5/8" (68mm) so you'll probably want the 2 3/4" (70mm) bit.

 

[DgenR8]

Thanks Joe. I ordered two, just in case