If I'm just sewing, I usually have a 4.5 or 6.5 square by my machine so I can do a quick check if I think something is a bit off. If I am cutting, I would use my 8.5x24 or 6x24 and probably a 6x12. I do not have a bunch of specialty rulers. But I adore my BlocLoc rulers for trimming HST's. Best gift I ever got!