The Strip Tube Ruler - Cozy Quilt Designs (Pre-order: Aug 2026)

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 2-1/2in strips. With this great gadget, you can easily make accurate half square triangles from 1in to 9-1/2in!