The classic Jenerates Sewing Ruler - in centimetres or inches. Starts at zero at both the inside and outside corners so you can use it whichever way best lets you see your work. Cut-outs to make easy work of adding or subtracting a seam or hem allowance - great for hacking patterns! Quilting version with 1/4 inch cut out for marking seams and checking needle position.
 
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Let me know if you would like a gift message printed with your purchase - there's a box for that in the checkout. 
 
If you're buying from outside the UK - please buy through Etsy to have the correct tax applied. This should save you paying any local handling charge in addition to any tax.