INCRA 300mm Metric Centering Rule brings the simplicity and precision of metric measurements to your workshop. This 300mm ruler not only measures but also marks with accuracy. Simply line it up, place a 0.5mm pencil in the precision slots, and your mark will be exactly where it needs to be. The ruler features marking holes every 1mm and instantly marks the center of your workpiece. It is graduated from the center outward for 150mm in both directions, making it easy to work symmetrically. Additionally, it includes a protractor with built-in guide slots at every 5-degree interval, highlighting commonly used angles of 45, 30, and 22.5 degrees for versatile marking. Crafted from durable stainless steel and made in the USA, this tool is designed for accuracy and longevity.