The Quick Trim Ruler features 90° angles that add the seam allowance when cutting triangles, eliminating the points. Use the eight drilled holes at one end as pivot points to draw circles from 2" to 22" -- and every half inch in between. Simply place a marking tool in the large holes drilled down the center of the ruler and rotate it 360°. This 3 1/2" x 12 1/2" rectangle features easy-to-read black and white markings printed in 1" grids marked in 1/8" and 1/4" increments. Our exclusive embedded gripper strips hold the fabric while cutting when pressure is applied. Turn it around to cut whole inches. Horizontal and vertical lines are printed on the rectangle so the center of the ruler is easily distinguishable.