These needle size/gauge swatch/yarn cutting tools are fantastic. They are made in Japan. This is a must-have for every knitter.
On one side, it shows US knitting needle sizes and inches, and on the other side is shows metric needle sizes and centimeters.
There's a built-in yarn cutter at the top, which is especially good for traveling by plane.
I have one of these in my purse to go with the knitting project I always carry on the go.
If you crochet and are happy to use metric sizes for your hooks, you can use this too.
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