Klipits have a specially designed flat top on the mouth of the clip that angles down and doubles as a ruler with 1/2″ and 1/4″ seam markings so that you can measure your binding. The flat bottom of the clip incorporates the same 1/2″ and 1/4″ seam guides with the addition of a 3/8″ seam guide that will help you adjust the clip so that you can use a zipper foot and easily stitch in the ditch without removing the binding clip.