Conform to: ASME B107.4. Made from chrome vanadium steel with a highly polished mirror finish. Made to American Federal Standards, giving higher torque therefore improved performance. The wrench will fit over the pipe to give a positive location on the nut. Can be used on hydraulic pipes, brake pipes etc. | | Contents | 5/16″ x 3/8″, 3/8″ x 7/16″, 1/2″ x 9/16″ and 5/8″ x 11/16″.