It's Sew Emma Triangles on a Roll
Triangles on a Roll grid paper is the answer to the half-square and quarter-square triangle dilemma.
It offers the most efficient and flexible method for making triangles. The paper 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 or use two to four different fabrics for quarter square triangles.
No more cutting on the bias, no more measuring and cutting 7/8 inches, all seam allowances are included in the pattern. All you have to do is select your fabrics, pin them together with the paper, sew and cut!
You will have accurate half-square or quarter square triangles in a jiffy with a minimum of hassle.