The HQ Multi Clamshells is one of the many quilting tools that will enhance your machine quilting skills. The template is made from high quality .25-inch thick acrylic for durability.Guidelines are etched in on the surface of the ruler. Use this multi-sided tool to make clamshell designs with 1.5-inch, 2-inch, 3-inch, and 4-inch repeats. Packaging includes instructions for use, safety tips, and design ideas. For best results, always use the HQ Ruler Base when using a ruler or template.