I haven't figured out what they do yet. I can't pick things up with them, they don't open anything for me and they are very hard for me to reach. I wish I had two more on each foot because then I think I could really climb a tree. While I'm adding things, I'd like to have three more fingers on each hand also. This blog took me two hours to type. I think if I had six more fingers I could cut that in half. And then, if I learned how to type with my feet and all of those extra toes I might be the best typer ever. I'm going to call Dr. Drew and see if he knows anything about this.