The ten degree wedge creates wonderful circular quilts. Thirty-six wedge pieces make circles up to 45 inches. Or, use the same wedge to cut extensions to create a circle up to 66 inches. Eighteen wedges make a semi-circle; nine make a quarter circle. 20, 30, 45 and 60 degree angle lines add endless design possibilities. The ruler slides easily over the fabric until pressure is applied. Then, our exclusive gripper holds the fabric in place while cutting, eliminating slipping and miss-cuts!