We have 4 Lamp Finials metal Vintage items.  They are similar with different measurements - the first photo on the left is  about 1" in H x about 1" across the bottom.  The center ones are about 1/2" x 1" and 1/2" x 3/4" on the bottom.  The last one on the far right is about 5/8" x 5/8".  They all have threaded centers which measure 1/4"  across the center threaded part. They are in fair to good condition with 3 of the 4 in fair condition.  There are quite a few scratches on the finishes on these.

4 Lamp Finials metal Vintage