Did a Google search for diamond coating bits and bulkheads so I could check some prices and see what people had to offer. Found several sites that were asking way too much and then found these guys. The prices looked almost too low to believe so I decided to order and see what I got.

Ordered 4 of his 1.5" bulkheads and a diamond coated hole saw to drill my tank. Ordered them on Monday and everything showed up on Wednesday. So far I'm very impressed but will need to try the drill bit out to see if it's good quality. But for 37.00 total for the entire order (32.00 for 4 bulkheads and the bit, 5.00 shipping) I couldn't go wrong.