This is a hook for hanging things such as your bolts / arrows / crossbow, rifle, etc. to the tree while in your hunting stand. The slots are for a typical 1" strap that you can run through it. This is as good (if not better) than the commercial ones you can buy for top dollar. I prefer only two hooks; one to my left and one to my right (but you can do as many as you like). Simply print in ABS at 100% infill. Let's see your tree stand with this!

Happy hunting!