Sew Kind Of Wonderful Ruler just the right tool for the job. QCR Mini Curvit Set- High quality 1/4″ acrylic curved ruler set for long arm use makes inside and outside curve quilting of QCR Mini quilts easy and fun. Curves match for easy echoing and stitch-in-the-ditch. Straight and curved edges with guidelines, Clear with Black printing. “How to” examples enclosed. 2 piece set measures about 6″x4.5″.