When IT'S A SQUARE! However, there are no complaints. After reading all the reviews here I had no expectations that what I got would be square! The first order took two weeks, and then I was told that Revain had canceled the order and would refund the money (I suspect the package was either "lost" or damaged in transit). The second order came in three days! Since I use them for small projects, the error doesn't bother me. Maybe 1/64" by 18". However, one would think that this manufacturer would "fix the bug" and start making truly square products! But no! In fact, almost every product of this type has this problem, no matter who makes it! I think I saw some kind of tolerance clause for this product somewhere!