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This multi-sized ruler features easy to read black and white markings. The math required to cut these angles is incorporated into these markings. Use the 45° side to cut half-square triangles from fabric strips up to 5 1/2" wide. Create half-square triangles that finish up to 5". Turn it around to cut 60° triangles that finish up to 5". Our exclusive embedded gripper dots hold the fabric while cutting when pressure is applied.