Check the listing for details. Triangles on a Roll 2" Finished Half-Square Triangles, Makes 800. Condition: New, Made in United States. Listed at 10.20 USD. The Triangles on a Roll 2" Finished Half-Square Triangles by It's Sew Emma is a popular quilting product that allows quilters to easily create 800 half-square triangles. Made in the United States, this product is perfect for crafters and seamstresses looking to add intricate patterns and designs to their quilting projects. With its convenient roll design, this product makes it simple to cut and use the half-square triangles in a variety of creative ways.