This is a N.O.S. = New Old Stock Craftsman USA 4mm. shallow 6 point socket with a 1/4″ drive size. It is a standard metric socket made in the United States. The socket features a chrome surface finish and is perfect for automotive use CRAFTSMAN hand tools are known for their quality and durability. This socket is a reliable and essential tool for any mechanic or automotive D.I.Y. enthusiast.