Circle Ruler with Integrated Circle Templates makes it easy to draw precise circles up to 12" in diameter. It is the perfect tool for young students working on mastering geometry & angles. Unique product is much easier for young children to manipulate & use than a standard compass. Integrated design means that they can more easily understand how angles & measurements correspond with each other. To make larger circles with this innovative, three-in-one ruler & compass, simply place pen or pencil in the appropriate hole (1/8" increments), hold the center disk & sweep the ruler around its center point. Smaller circles from 1/16" to 9/16" diameter are easily drawn with the integrated circle templates into the ruler body. Graduations up to 12" / 30cm along the outer edge of the ruler are perfect for measuring.