The MAC Tools D2A 3/8 X 5/16 Open End Wrench is a vintage hand tool made in the United States. This single item wrench has a size of 5/16 x 3/8 and is designed for use with SAE measurements. The open-end design makes it easy to grip and maneuver in tight spaces. Known for its quality and durability, this Mac Tools wrench is a reliable addition to any automotive tool collection.