Hevemi, If you haven't tried the square in a square ruler you are missing out. You will never have to sew triangles together again and you get perfect points. Go to www.squareinasquare.com. Jody Barrows is the creator of this ruler and you will save so much time you won't believe it. I cannot find this ruler in any store but you can order it through her site. If you order the DVD that is all you will need besides the ruler. Believe me, my points never met until I purchased this ruler. Now they do. You will be amazed. Good luck. Rose