The product is a lot of 6 crimp fittings by Eaton Weatherhead, made of carbon steel with a straight fitting shape. 04u-j04 The end A diameter is 3/8 inch and the end B diameter is 1/4 inch. These fittings have a crimp-to-NPT connection and are used in hydraulics, pneumatics, pumps, and plumbing applications. This product is made in the United States and is designed for fast shipping.