I am unsure what the material is but it seems to be brass. The wheel is 6 1/2 inches in diameter. It is heavy for its size, weighing exactly 3 pounds. The hook part looks like it had another piece attached. It has the markings "A-87" and "A-20" on it in two different spots. The wheel does turn. The wheel spokes are a different metal than the rest of the pulley. I have searched for a similar design but could not find anything. Selling as is. Please see all of the photos. Shipped using USPS.

Thank you.