Dritz-Omnicraft centering ruler. A high precision multi-purpose centering ruler with enhanced double lines for use on light and dark surfaces. Has marking holes for aligning grommets eyelets stitching and more. Includes 30 45 and 60 degree angle lines for diagonal cutting and marking. This package contains three 18x2-1/2 inch centering rulers with a zero in the middle for accurate and effortless centering of objects. Made in USA.