If you have windows that tilt inward for cleaning they might use these fragile metal pins. They seem to break easily and I got tired of having to have the window guy come in to replace them so I modeled them and tried them. They work fine, so far. I used PETG because it's strong and has a slight flexibility to it. If you found this useful, please donate what you think it is worth to my paypal.me/BrownsBrain. Thanks, Enjoy!