As it turns out, this Clamp Hub was specifically designed to work with the new iMac (24-inch, M1, 2021) due to its new square design. Because of this, our hub will not clamp onto the older iMacs with a round back, as the clamping mechanism has changed from our previous Clamp Hub! If you are interested in a Clamp Hub for iMacs from 2017-2020, please look into the Clamp Hub linked below!
We hope this information has been able to provide a bit of clarification and guidance for you.
Please feel free to open a ticket below if you were to have any further inquiries we can assist you with.