Phillips Fiber Art Ten Degree Squared Extension Phillips Fiber Art ruler ten Degree squared extension Phillips Fiber Art clear Acrylic rulers are great for a variety of quilting and craft projects Designed with the quilter in mind, your creativity just became easier Ten Degree squared extension- add this extension to the ten Degree wedge tool to make a 54Square instead of a circle Includes a .5Seam allowance bar, yardage requirements and Full color diagram