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Amazon.com: Koala Tools - Mini Ring Ruler for Circle Templates and Surfaces, Circular Ruler with 1 to 3.5-inch Adjustable Diameter, Geometric Tool for Drawing Circles
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Amazon.com: Koala Tools | Ring Ruler 360 - Circle Stencil & Templates Tool | 3"- 6" Adjustable Diameter - Geometric Tool for Drawing Circles : Arts, Crafts & Sewing
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