I only use three rulers regularly enough to need them. One is my 5x18 inch ruler with lip. I find the 6x24 awkward, guess I am weird. Can't live with out my june tailor shape cut plus ruler. I use that out of all my rulers the most for all my strip quilts. and the other one would be my 6 inch or 8inch square rulers. I find if you square up as you go the blocks, there is less need to square it later