I've gotten quite a bit of use out of that particular one... it's the right size for a sch 40 1" bulkhead.
Double check to be sure the tank isn't tempered (it's easy with a couple polarizing filters), and keep a dribble of water on it as you go. There is some technique but it's pretty simple. funman1 has a really good video you should find and watch first.
You can use 2 polarized filters, one on each side of the glass. This works best for me out in the sun.... roate one of the filters until most of the ligh is blocked and move them simultaneously across the glass. A light and dark pattern indicates it's tempered. If the color is all uniform it should be safe to drill. Try the filters on the side window of a car. It's tempered for sure and will show the effect.
The least expensive polarizing material I have found comes as plastic film. Polarized camera filters are great but pricy. Polarized sunglasses are usually to dark and make the pattern difficult to see.
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