Home Sewing Depot 24 Inch Folding Square Ruler 24" Easy Square Folding Ruler to square and miter corners. GREAT QUALITY - See-thru polycarbonate. Won't chip, crack or break EASY TO USE - Fine lines for accuracy. PREVENT DISTORTIONS AND SHADOWS - Black graphics printed on the under side of the ruler. PREFECT FOR MANY PROJECTS - for mtered corners, square corners, make triangles, bais strips,etc