Those are the female contacts that are inserted into a housing for constructing a custom connector. There are insertion and removal tools available for these, and if you're careful, you can make your own. Often, insertion is a simple push-it-in-with-your-finger operation. Removal requires a thin, hollow tube that will fit between contact and housing to push those wings in toward the contact body so you can push the thing out. Check out the AMP or Amphenol web site or one of their catalogs.