You asked for it, we did it! Introducing Cozy's Strip Tube Rulerâ?-! This ruler makes half square triangles a breeze by combining brilliant engineering with the tube technique. It's 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! Take a Peek at all of the wonderful Cozy patterns made even easier with the Strip Tube Rulerâ?-! Check out our Strip Tubing book for five fast and fabulous quilts using the Strip Tube Rulerâ?-! Click here for a great guide to using this ruler to easily square up Half Square Triangles and chart on how what size to make your tube for Half Square Triangles.