Unknown double pane pull down window clip

You have a broken pivot shoe in your window. You need to remove the sash and show us the complete pivot shoe. We will need the width and thickness of the pivot shoe, as well. See our media guides for more information. They can be found elsewhere on this webpage.

I'm afraid I still can't tell what you have. You're only showing us a piece of the pivot shoe that has broken off. This isn't it's own individual piece, just a chunk off the piece you need. We need to see the entire pivot shoe. I can partially see it in your second photo in your first picture, but I can't see the whole thing. I will also need its width and thickness.