Professional Ruler Square/Stop

With this simple and quick 3D-printed part, you can turn any metal ruler into a precise and sturdy stop ruler.Its smart design ensures a tight fit with no wobble, giving you maximum accuracy in measuring and cuttingFor extra strength, you can also add a 20×3 mm coin battery, although the printed part alone works perfectly as a ruler stop.Plus, it can also be used as a square. Easy to print, quick to install, and guaranteed to make working with your ruler more professional and enjoyable."