We have a cast iron decorative salvage piece. I'm not certain if it is a single curtain bracket holder? It measures about 3 3/4" in H x about 1 1/4" in W across the widest point. It is about 1 7/8" in D with both "arms" having a 3/8" across hole towards the front. It has some light color of red and green with a tad bit of rust.