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you can use 1/4 no problem, thats what ive used. its easy to countersink and bends really easy if you making a rainbow or whatever. the problem is once it gets older it will crack on the corners when you countersink most likely. I would go with ½ inch if I had a choice and money wasn’t an issue ¼ doesn’t crack that bad but it has more of a potential to. You could use beafier screw on ½ inch too which would be nice