Although the statement on the website says "Can be adjusted to fit internal dimensions from 172mm to 540mm (6, 77โณ 21.26โณ), 2.0" to 4.5" rod diameter, what they forgot to say is that you have to buy your own large pipe clamps or U-bolts to make this because the two provided Pipe clamps are too small even for a 2" diameter rod. And it's almost guaranteed that you'll have to drill holes in your solar panel to attach the panel to the bracket. , except for small problems that you should be aware of. Overall the holder is well designed and I think it will be strong enough to support the panel over time. If not I will update the review later.
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