Sew Kind Of Wonderful Ruler just the right tool for the job. QCR Curvit Set- High quality 1/4" acrylic curved ruler set for long arm use makes inside and outside curve quilting of QCR quilts easy and fun. Curves match for easy echoing and stitch-in-the-ditch, create quilting scallops in borders and great for curved crosshatching. Can also be used to mark quilts for domestic machine quilting. Straight and curved edges with guidelines, Clear with Black printing. "How to" examples enclosed. 2 piece set measures about 10"x 4. 75"