The multi tool is a 1/4" (6 mm) thick acrylic ruler perfect for a wide range of ruler work techniques. Its unique shape allows for both straight-line and curved stitching, making it ideal for stitch-in-the-ditch, echoing, parallel lines, and cross-hatching. These have white and black markings making it easy to see on all fabrics. They also have a non-skid surface on the back.