I thought I had responded earlier. I went down and unfolded some of the 1/2" double wide bias tape I have. When folded all the way out to single layer it as just a little shy of two inches. I recently got some cutting mats that the grids were not correct. Are you using a metal or wooden ruler? Although most of the quilting rulers are correct. Very strange.
Janey - Neat people never make the exciting discoveries I do.
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