This 8in x 3in Mini Scallop ruler is for perfect mini-clamshells. Use the straight side for stitch-in-the-ditch and straight lines. Packaging includes instructions for use, safety tips and design ideas. Made from .1/4 inch thick quality acrylic. Use on your Handi Quilter long-arm machine with the suitable HQ Ruler Base, or with the table overlay on your Sweet Sixteen.