occur. Standard spacing In order to permit the use of double banana plugs, the most common distance between the centers of the plugs should be inch (19.05 mm), which originated on General Radio test equipment during the 1920s, however inch is not the only spacing. See also Banana connector Fahnestock clip — an earlier device, now largely supplanted by binding posts References External links About.com glossary definition Binding Posts - Pomona Electronics Electrical connectors