Quossum, I'm not sure if Bonnie's ruler is available other than at her own website, but it accomplishes the same tasks as the Easy Angle ruler combined with the Companion Angle ruler, if you have those on hand. For the QSTs, you'd want the Companion Angle. But i would encourage you to try what she calls the traditional method (the method she always lists first), as I have better accuracy with that than the other. One thing you can say about Bonnie's quilts is that they will definitely make you a better piecer!