This is a brilliant pair of Victorian crystal mercury bottom 12 point door knobs. As beautiful today as the day they were made. They will look stunning on any door new or old. They are tight fitting in their brass mounts. This pair has both set screws and a spindle. One of the screws is rusty but still turns. The knobs measure 2" point to point. They glow yellow slightly under the ultra violet light which would indicate the presence of manganese. Use the zoom to inspect and feel free to ask questions.