This is an antique, huge wrench that was once used by the Southern Pacific Railroad. It has an open end design and can accommodate railroad bolts with a size of 1/2 and 5/8. The wrench is a collectible item that is perfect for those who are interested in railroadiana and trains. It was made in the United States. The wrench is a great addition to any collection of hardware tools and is sure to be a conversation starter. Has wear and light rusting. Cool piece of railroadiana.