Pattern-making and Grading Ruler (50cm metric) 1.2mm thickness Flexible plastic grading ruler Lightweight, clear ruler with grid patterns in metric 50cm length, Easy-to-use 50cm length pattern making ruler 1.2mm thick flexible plastic Red & Green color Easy-to-read This ruler is perfect for sewing and knitting drafts, pattern making / grading or drawing seam lines. It is made of a flexible material to help measure curved portions. With it, parallel lines can be drawn accurately at several distances. The metric markings are printed on clear plastic so you can clearly read scales, even on dark-coloured fabrics and easily draw a true bias line with a 45° line.