Quick Trim & Circle Ruler XL features easy to read black and white markings and has 1" grid with .125" and .25" increments. The numerical white dots and 1/4" grip sides cut whole inches. Turn-a-Round to use the .5" grip side and numerical black dots to add the seam allowance. Use the holes that go down the middle of the ruler to draw circles in .5" increments from 1" to 46". The gripper holds fabric while cutting, so you can cut any 45 degree angle including the seam allowance.