I had a bunch of 4 1/4" squares left over from another quilt that I'd made. I took a regular straight edge ruler and angled in from each top corner 1 1/2" at the bottom. Made a perfect tumbler quilt. If you get the template, don't cut around all four sides. Cut strips the width that the template is tall. Then just place your template on and cut on each side. Flip it upside down for the next cut.
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My computer wont make the line underneath but that's sort of what it should look like.