This tool is equivalent to a 6" ruler with raised 1/16" increment markings. It does not have any numbers on it, but line lengths vary at each " ¼ , ½, ¾, and 1" increment. The unmarked edge of this tool is tapered, and would serve as a child safe clay blade. It is not nearly as sharp as a steel blade. Many of the pro bead roller sets now have a 1/16 inch rule inscribed on the side of the sets, so a measuring guide may not be necessary when purchasing Pro Bead Roller Sets. This tool will be most helpful when purchasing BRLR BRSR BRBI or BRCR The registration lines were darkened for image. The tools is clear.