I printed an item from another creator that had multiple pieces all with a 5mm hole.  I needed something to store these items on. I decided make a quick split ring to hold them. After I was done I backtracked to make this parametric so others can customize to their uses. While this is a simple design, it is my first go at a parametric model. Hope it works for all your use cases. Open to any feedback!

The attached profile is for a ring with 40mm inner diameter and 3.5mm width