This Sew Easy French Curve ruler is an essential tool for sewing and dressmaking. It includes a grading grid which can be used to add seam allowances as well as grade patterns. It’s ideal for redrawing, editing or measuring patterns accurately. Also, the french curve ruler is large enough to follow the curve of skirts and other large hemmed garments. It’s a versatile accessory for both the home dressmaker, student and professional designer!