GO! Half Square Triangle - 4 1/2" Finished Square Die (#55397)Two half square triangles sewn together form a 4 1 2" finished square. Triangles are a basic building block in quilting. Arrange triangles in colorful combinations for great quilt designs. Product Details AQ Cutting Mat Required: GO! Cutting Mat, 6 in. x 6 in. (15. 2 cm x 15. 2 cm) How to Die Cut 4 1 2" Finished Half Square Triangles: For best cutting results, position fabric on the lengthwise grain (straight of grain) as it goes under the roller. Cut