Glass Jar lids?

I picked up several blue glass jar lids at a country antique store. They are the color of the blue Ball canning jars and look like coasters. They are not the kind, nor do they fit, the jars with the rubber seal and metal wire clamp. They seam to be smaller than any narrow mouth jar I have. There are no threads, like I said they look just like coasters and match the Ball blue canning jar exactly. I also picked up a couple metal ones with a keyhole like cut-out in the top along with the glass "Presto" disc lids, cute!