I use 12.5 ruler a lot also. It is perfect for the carpentar's wheel block in the larger size block. The most used is my 6x24 hands down and then I would have to say 6.5 for squaring up. My I suggest b4 shopping for new sewing /quilting items ck to see if your town has a Tues. Morning store. I just purchased a june taylor sq up ruler there for very little $ less than coupon at Joanns. I hope this is alright to say? Please let me know if not. I have no connection to either store, but I surely wish I did. How cool would that be. Id be broke though, I would give too much away. LOL Blessings Deanna