This Circle Savvy Ruler by Creative Grids provides everything you need for easy and accurate measuring and cutting of circles! Use it to cut circles, semi-circles and quarter-circles from 3" to 15-1/2" and every 1/2" in-between. Useful for fusible appliqué, piecing and turned-edge appliqué. The ruler slides over fabric until pressure is applied. Then, its grip feature holds the fabric in place while cutting, eliminating slipping and miscuts.