The leaf stands are designed for round glass discs, 3mm-9mm thick.
They can all be adjusted to fit a slightly larger piece, for example you can gently stretch the 6” to accommodate a 8” by slowly stretching the stem at the knuckle points. There is a video on the website that explains how to do this. The 8” will open to fit a 10” and the 10” will open to fit a 12”. This allows for flexibility displaying your art.
The aluminum is very soft and flexible so please do this gently.