Stencil Design Ruler \tBest tool to have different Spirograph designs. \tEasy and convenient to use. \tHealthy and creative activity. \tSpecial item for art lovers. \tOne can make 100's of different designs. \tThree different wheels for better and unique design. \tFancy Item. Description This is a ruler that can be used to create precise lines and shapes. It is often used by artists and crafters to create perfectly symmetrical designs. Stencil Design Ruler is a great way to create perfect, evenly-spaced lines on fabric, paper, or other materials. This type of ruler is made of clear plastic or acrylic, and has a series of small holes or slots cut into it. To use a stencil ruler, simply place it on top of your material, aligning the holes with the desired spacing, and then trace around the edge of the ruler with a pen or pencil.