This watch stand fits two round and one square-style watch.  Placing in the window seal allows my 2 solar watches to get charged and my Casio Atomic 6 band watch can point towards Colorado for nightly updates. I don't have to worry about them falling off. The only supports needed are for the base. I did run a 5/8-18 tap through the nuts. It then screwed together like a class 3 thread. You will need to print out 2 nuts.