We found this among a pile of rusty tools. I cleaned it up but we don't know what it's used for - some kind of scoring and also possibly a wrench-like key for turning something with 2 square indentations in it? The tool is about 12 inches long with no markings on it except "made in u.s.a." Between the 2 square protrusions are 2 identical, independent free-running wheels as seen in pics. It is obviously a specialized tool. We look forward to hearing from anyone who recognizes it.