Strip Tube Ruler
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This ruler makes half square triangles a breeze by combining brilliant engineering with the tube technique. Its perfect to use with strips and even includes directions to make our favorite block from 2½ strips: The Daniela Block. With this great gadget, you can easily make accurate half square triangles from 1 to 9½!
Junior has all the talents and magic of the original Strip Tube Ruler but comes in a smaller, more convenient size. Junior is perfect for making blocks 6-1/2in or smaller. Junior is also wonderful for squaring up any blocks that have a diagonal seam with just one cut. Junior Ruler can be found here