Abstract: A tool for tensioning a fence wire winds the fence wire around a barb-like article that remains in the fence after the tool has been removed. The barb-like article includes a first piece of wire that is substantially rigid and that extends parallel to but spaced from the fence wire, and further includes a second piece of wire that is joined to the first piece of wire and that has a U-shaped central portion that partially encircles the first piece of wire at its center and is bonded to it, the legs of the U-shaped central portion straddling the fence wire so that as the article is rotated by use of the tensioning tool, the fence wire is wound around the legs. One of the legs terminates in a crook which the user engages to the fence wire to prevent it from unwinding from the article, which thereby becomes a permanent part of the fence.