I've been wanting to hang my second monitor for a long time but have lost the other arm that came with the original VIVO dual monitor stand that you buy aftermarket can revain. I was afraid I would need a different part but this worked great. As long as you have a base that attaches to your table, that's all you need. There weren't any step-by-step instructions in the box I received, but it's pretty easy. If you need instructions, search the listing for a dual monitor stand. There you will find a video showing you how to assemble it.