Diamond tip hole saw bit

[polarbear]

I'm looking to buy one off amazon but there are so many to choose from. I'm going to use a once inch bulk head so I know I need to buy a 45mm bit. Which one would you recommend buying? I found one buy CPR aquatics for $11 but saw other larger sets for half the price.

im looking to buy it tonight or tomorrow. Also if anyone has some local to rent, use or buy please let me know.

[Zephyr Aquatics]

I only use the glass-holes bits!

[polarbear]

Thanks