I really am not sure what to call these or indeed where they have come from. I'm guessing they probably came off of a control panel of some sort. They are brass with a glass insert. Most are approx 12mm tall with the brass insert section being 8mm across and 6mm deep with a slight collar which is a further 1mm. There are 2 much larger which are 19mm tall and the brass inserting section 12mm across the bottom and 11mm deep. See photos below for details.