US Patent 7010998 Sockets and method of surface treatment for sockets

A socket has a dark colored outer surface and a specification rolled in the outer surface of the socket and coated with a brighter colored electroplating. The method for the surface treatment of the socket includes rolling the specification in an outer surface of the socket; electroplating the socket with a light colored layer of electroplating; removing the light colored layer of electroplating from the outer surface of the socket except for the specification and coating a dark colored layer on the outer surface of the large section except for the specification. By the surface treatment, the specification is obvious from the dark colored outer surface of the socket.