This Sew Easy French Curve Ruler is an invaluable tool for dressmaking, drafting and grading patterns, helping you alter the patterns for your personal fit. It has combinations of curves for neck holes, armholes, waistbands, sleeve caps, hemlines and hip curves. It also allows you to add seam allowances to block patterns.This curve ruler is great to use when tracing patterns and it comes with full instructions. It is a very versatile accessory for the professional designer, the home dressmaker and the student. Size: 52 x 16.5 cm (20.5 x 6.5 inches)Imperial measurementsAllows you to add seam allowanceIdeal for neck holes, armholes, waistband, hip curves and moreSew Easy French Curve Ruler