The Creative Gris rulers do not have 1/8' SOLID lines in TWO directions. Yes, virtually every ruler has some sort of 1/8" hash marks.
The Bias Square was designed for HSTs, yes, but it is workable and valuable on so many more squares than just those! You can square up any block or section thereof by trimming just a fraction off using those 1/8" lines.
I just wish they'd make it in a 12" square!!!!
Jan in VA