Yes, it will fit in the 13" direction. The 12 X 13 mat is slightly thinner than the 8 X 13 mat, so the ruler doesn't fit quite as snuggly, but I think it would work fine. It's nice to have the tabs on the end help keep the ruler straight, almost like a T-square ruler. (Sorry it took me a while to answer, but I was out of town and couldn't try it on my supplies until I got home.)
By: carolmelancon
(13-Oct-15)
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