Great for squaring pieced blocks and cutting larger pieces. Works well as a template for pillow tops and simple square patchwork designs. This acrylic ruler is non-slip and is marked with black numbers and lines for clarity, your measurements will be clear and easy to read on light and dark fabrics. Has easy to read grid lines; 1-inch grid with 1/2-inch, 1/4-inch and 1/8-inch increments for precise measurements. For right or left-handed use!