The Dritz See-Thru ruler is a transparent ruler that allows you to see your project under the ruler for accurate positioning and marking. The ruler is designed with multiple markings for measuring: 1/16" outer edge marks, 1/8" grid with inch marks, 18" ruler and 1/2" spaced holes for centering. Use to enlarge patterns, establish parallel or perpendicular lines, draw scallops and draw circles.