The Strip Tube Ruler makes half square triangles a breeze by combining brilliant engineering with “the tube technique.” It even includes directions to make our favorite block from 2-1/2in strips. It’s perfect to use with strips and with this great gadget, you can easily make accurate half square triangles from 1″ to 9 1/2″.
Be sure to also take a look at the Strip Tube Junior Ruler which has all the talents and magic of the original, but comes in a smaller, more convenient size. The Strip Tube Junior Ruler is perfect for making blocks 6 1/2″ or smaller. Just like using a smaller square-up ruler, a smaller Strip Tube Ruler™gives you the right tool for the right job. The Strip Tube Junior Ruler is also wonderful for squaring up any blocks that have a diagonal seam with just one cut!