Marti Michelle has a ruler (tool) and it comes with instructions and it makes the twister block. Although with her ruler you don't have to start with the blocks all sewn together like with the other ruler. With her method you can use a charm pack or a layer cake, or just yardage cut into squares, and put the ruler down and cut the pieces out and sew them together according to the instructions. I made one and found that it doesn't waste as much fabric as with the other method. You might look into it. Gina