These are glass chimneys that fit old style lamps. The fitter or bottom diameter is 1 3/4 inches wide and the height is 6 inches. They go over the bulb or wick on old or replicated lamps. We had many antique lamps but no longer do, so I am selling these. I have three of them. The brand says Schott Duran on the glass. They were made in West Germany. They are clear and in new condition.