Sew together twelve 30 degree triangles to create a complete circle; six to create a half-circle; or three to create a quarter-circle. Or, use the angles to create a variety of intricate 12in finished blocks - no paper templates required! 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! Total Size - 4-1/2in x 9-3/4in Creative Grids® products are made in the USA and sold in independent quilt shops only.