Omnigrid's Rectangle Rulers are great for cutting strips, shapes, and bias pieces when quilting or when crafting. Use these rulers with a rotary cutter or a straight-edge blade to get crisp edges. Each ruler is made of a heavy-duty, durable acrylic material that's resistant to breaking and chipping. There are multiple degree angle lines for easy pivot of 30 ­ °, 45 ° and 60 ° cuts. Plus, with the patented double-sight lines that show up on both light and dark fabrics, you see exactly where you will be cutting. With its laser-cut edges, both right and left-handed people can use Omnigrid's Rectangle Ruler. To see instructions on how to best use these rulers, download this free PDF.