90 Degree Double Strip Quilt Ruler, 10 Inch Acrylic Quilting Triangle Rulers, Non-Slip Quilting Rulers and Templates - AliExpress

Use the straight side of this double strip ruler to cut 1-1/2 and 2-1/2 inch strips – or use the pre-cuts that are on the market. Sew these strips together to create a 4-1/2 inch wide strip set. Turn-a-Round the ruler to cut three 90 degree triangles that finish 4 inches. Multiple layers can be cut at one time. The key holes in the ruler enable the rotary cutter to cut the sides without damaging the ruler.

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