I just looked it up on the net. I would rather keep one of my reference sheets and not buy that product. I can measure with my current rulers the 1/4" for the seam allowances, the 7/8" for the HST, and the 1 1/4" for the QST.
There are so many other great tools out there that I would much rather have.
I bought the Alto's QuiltCut2 and use it so often that I store it under my TV cabinet in the living room. [I made a black rip stop nylon drape to cover it up so it doesn't look out of place.
ali