the best place to look for the dimensions is on the homepage: https://www.arctic.de/Liquid-Fre... .
Since I don't want to open up my pc again and measure it, with the attachment - 68.5mm specified at arctic and base plate I would say around 80mm.
Greetings

Hello. I suppose it's the size of the block on top of the processor that you're interested in. In this case, the block is 70mm high with a diameter of 90mm.