Jupiter

First let me say that I have not yet made any of these blocks, so I may find out soon enough the reason to want a ruler with holes in it.

I thumbed through the book. The square ruler with the holes drilled into it are used to help you pick out a 'fussy cut' spot, and then be able to make a dot through the ruler to mark your edges. Remove the ruler connect the dots and add seam allowance to it before you cut.

I think if you have a 6.5" X 6.5" ruler you'll be fine with that. If you want to order one with the holes in it, the 6.5" size is what she is showing in the book.

I am going to start with what I already have. Its easy to add one on later if I need it.

Hope that helps some.

hugs, Jupiter