Sofia Kalaitzidi 5 This is the best ruler for pattern cutting !I am a professional pattern cutter in London, UK ,I work in fashion industry. Since I have been introduced to these rulers by my Japanese friend I can't use anything else but these amazing rulers! Can't get enough of them and always recommend this ruler to all my colleagues!These are perfect for adding seam allowance to pattern pieces as the ruler has lines at 0.5 cm , 0.7 cm for bagged out edges, 1cm for regular seam allowance and 1.2 cm for perfect width of pocket welt. Small but powerful pattern cutting tool!I am so happy I could order this straight away from Amazon Japan to be delivered to UK . Thank you!