Kapro 314 SET & MATCH® SYSTEM – Build your perfect DIY tool with mix&match accessories. This ruler is crafted with an aluminum straightedge and printed markings for accuracy and longevity. The ruler features a zero-center scale, which is perfect for measuring from the center point of your project, and an anti-slip feature that ensures the ruler stays in place while you work. The ruler also includes two cylindrical sliding vials for both horizontal and vertical measurements.