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.