Serger cones fit perfectly in this pitifully easy to assemble and install rack. Lots of them. And who has a serger and doesn’t have lots of cones of thread? This is not my original idea. I found it on the forums of Patternreview.com while desperately searching for ways to organize my sewing room. I am merely passing it on. Paying it forward if you will. It’s a great idea, so thanks to the original poster, whoever you are.
Updated to add that the serger cones fall over so it’s best to store them lying down and they fit fine that way too.