Pyro-matic, Pat pend is what is on the small item that slides up and down the shaft. It has a small hole in it so the shaft is visible. The three at the top are steel, the other three are brass. I looked up Pyro-Matic and found out they make thermocouples and associated items, but none of their products look like these items. These were in an auction box lot about 10 years ago and have been hiding in my shop ever since.