the koralia 4 on 5/8"

[Borderjumper]

I have one on 1/2" glass and its still has a really strong pull. You should be fine.

[Slick Fork]

I've got a 3 on 1/2", maybe I'm just paranoid but I'd sure like to see the Koralias with a better magnet. It's not nearly as solid as the magnet on the tunze, but I guess when we put it into perspective it feels way more solid than those maddening suction cup mounts we had on the seio's so...