This is an iv bag holder that i made for my cat (kidney issues) to make giving her her IV drip easier. Having the bag hanging so high up makes it a lot easier on us to give her fluids since gravity does a lot of the work This hangs at the top of my closet door(1.375in thick), but fits the other doors in my house just fine, as long as they are open. My only concern with that is if the door were to swing, but that could be avoided with a long enough tube. The post is 7MM diameter and fits the bags we get just fine, but could be easily changed using the sldprt