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Triangles on a Roll grid paper is your answer to the half-square triangle dilemma. It offers the most efficient and accurate method for making half square triangles. The paper grid is a pattern for sewing and cutting. It is printed on a roll of paper that enables you to make as many or as few triangles as you want with two different fabrics.
Just imagine, no more cutting individual squares, cutting and sewing on the bias, and trimming each block. Simply select your fabrics, place them together (face to face), place the paper on top of the fabric, pin the layers together, then simply sew on the dotted lines and cut on the solid lines! You will have half square triangles in a jiffy with a minimum of hassle. See more detail here.
The seam allowances are included in the pattern, so all you need to do is sew and cut using the pattern on the paper. Instructions are provided on the paper. The amount of half square triangles each roll makes varies with size. Refer to the list below: