Once you use the Diamond coated hole saw you will not ever go back to using the Dremel I promise.
I have purchased one Diamond Hole Saw from the Ebay seller lau. I only needed to cut one last hole for my 1.5" Bulkhead. I think that it could easily cut 2 more holes. I had purchased a set of Diamond Hole Saws from a different seller off Ebay name was something like Richon_Tools. The bits are of the same quality. Both are out of Hong Kong. Both are way cheaper than anything you can find in the US. The bits that I have seen for the same purpose cost $50 to $90 each!!! Perhaps the expensive bits will last longer but not long enough to justify the massive jump in price.
I am not sure how many holes the expensive ones can cut but that is way too much money for bits when the Hong Kong units cut great and give you 3 to 4 holes. The glass I have been cutting varies from thick (120g AGA tank) to medium in thickness (50g AGA tank).
