Square Me Up Ruler by Back Porch Designs
Square Me Up Ruler (SMUP) uses 10" squares to make 4" finished size half-square triangles.
Use prepackaged 10" squares or cut four 10" squares from 1/3 yard of fabric.
Also makes 1 1/2" size half-square triangles from 5" squares of fabric.
A fun tool. Non-slip coating on the back makes it easy to use.Use for squaring up 7" Crazy Curves block too!