Besides the basic 6 in rulers the one I use the most is Quilt In A Days triangle square up ruler. The largest square ruler I have is 16 inches and I use it to square up quilts. Also have a few smaller square rulers from 6 to 9 in ones that I use to square up blocks. I have the shape cutter but never use it, don't want the bother of folding my fabric smaller to use it.