i have looked everywhere in my area for a dimand hole saw i had no luck so i called a local glass store they wanted 75 $ and they wold NOT be responsable if THEY cracked it so i asked some of the anderson reps. (im a AW servace and warrenty rep.) they all sayed go carbide. three holes latter and a 5$ hole saw it works well
remimber when drilling glass or using power tools safty first
three steps i used
1.H2O and alot of it
2.SLOW down DONT force it let the magic happen
3.test on some scraps (dont use your aquarium as a test of your skells)