These 24AWG (American Wire Gauge) 25 bare copper conductor RS-232 multiconductor cables are used to create serial patch cables for a wide variety of applications, usually for computer peripherals. RS-232 is a precursor to USB and is used for many of the same devices, such as printers, as well as modems. RS-232 is also commonly used for sophisticated machinery in laboratories, automated manufacturing plants, and other hi-tech environments. 100% Overall Foil Shield. Outer Diameter: 7.9 mm.