1、APPLICATION: Multi specification curves for pushing gears, all kinds of buttonholes, curve mapping and equal amount transfer, for drawing short curves such as sleeve holes or cuffs, crotch curves, neckline curves and so on.2、APPLICABLE POPULATION: Sewing curved ruler is an ideal tool for designers, tailors, students, beginners, seamstresses, pattern makers, light weight, easy to carry and store.3、HIGH ACCURACY SIZE: DIY sewing ruler with high accuracy size, clear and high accuracy, ideal tool for hand cutting.4、TRANSPARENT: The transparent design of Curve ruler won't cover up and is easy to use, suitable for pattern making, dressmaking, sewing and embroidery.5、5 ROUND HOLES: There are 5 round holes with different diameters on the curved ruler, unique round hole design allows you to enjoy DIY fun.