Omnigrid Ultimate Accuracy 6 1/2 inch by 24 inch All Purpose Ruler. Omnigrid Rulers are made of durable acrylic plastic with both yellow and black printing which allows you to see the grid on both light and dark fabrics. There is a left and right handed numbering system and the bias lines are oriented to the bottom of the ruler. This eliminates flipping and turning of the ruler to use both sets of the diagonal lines. Omnigrid Rulers are extremely accurate. Each ruler is laser cut to within .002-inch accuracy. This 6-1/2-inch by 24-inch ruler features an extra 1/2" width for seam allowances making it a timesaver for cutting borders when quilting. Use to cut 6-inch borders with seam allowances and to cut 6-1/2-inch strips for 6-1/2-inch blocks. Also great for cutting strips, borders and bias pieces. It also features multiple degree angle lines for easy pivot of 30, 45 and 60 degree cuts.