Omnigrip 20-1/2-Inch-by-20-1/2-Inch Non-Slip Diamond Free Quilter's Ruler Omnigrip Non-Slip Diamond Free Quilter's Ruler is made especially for quilting sewing and crafting projects and is great for beginners Features a clear background and neon lines Highlighted edge for trimming and no confusing angle markings Measures 20.5 by 20.5 inches