The product is a vintage Craftsman 17mm 12 point socket, made in the USA. It is a single item from a standard socket set, with a chrome surface finish. The socket has a 1/2 inch drive size and is designed for metric measurements. Despite the lack of a serial number, this high-quality socket is a valuable addition to any automotive tool collection. Please let me know if you have questions or would like additional photos. Thanks y’all!