Use the straight side of this triple strip ruler to cut 1 1/2" and 2 1/2" strips – or use the pre-cuts that are on the market. Sew these strips together to create a 6 1/2" wide strip set. Turn-a-Round the ruler to cut 120° triangles that finish to a height of 6". Flip the ruler around 180° to continue to cut without wasting any fabric. Markings on the ruler allow you to cut 120° triangles from 2 1/2"; 4 1/2"; or 6 1/2" strip sets. The holes in the ruler enable the rotary cutter to cut the triangles without damaging the ruler. Our exclusive embedded gripper dots hold the fabric while cutting when pressure is applied.