I have done many Twister quilts and I use the Twister Ruler (for 10" squares), the Lil Twister (for 5" squares), Primitive Pinwheels Ruler (for 3 1/2" squares) and the Itty Bitty Primitive Pinwheels Ruler (for 2 1/2" squares). I don't make my own rulers. I like the ones that are available.