Introducing a professional grade Proto double open-end wrench, model 3020. This highly sought-after tool is made in the United States and boasts a durable chrome finish. Measuring at 5/16" x 3/8", it is a specialized wrench designed for specialty drives. This item is a single piece and is perfect for automotive maintenance and other hand tool applications. It comes with no warranty and is listed as a non-domestic product. Purchase with confidence knowing that you are getting a top-of-the-line tool from a trusted brand.