Omnigrip 5 Inch Square Non-Slip Ruler by Omnigrid. The Non-Slip Ruler for Quilting, Sewing and Crafts. For use with Rotary Cutters & Straight Edge Blades. Right and Left-hand Numbering & Angle System. Diagonal Line for Triangle Cuts . Non-Slip Ruler with diagonal line for triangle cuts Made from durable, premium quality acrylic plastic Designed with markings for left and right handed users Features a clear background and neon lines Laser cut smooth edge allows for easier, deeper cutting of fabric layers