Demonstration of thread weight in crochet: three samples of filet crochet in the same pattern with different thread weights. From left to right: size 3, size 10, size 20. A U.S. quarter is included for size comparison. Respective crochet hooks used: 3.5mm, 2 (U.S.), and 6 (U.S.). All mercerized cotton, original design.
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Using coins for scale is discouraged as it will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins can also reinforce a geographical bias, and some coins' designs are copyrighted.
Ideally, a photograph should include a ruler with the subject (example) or an added scale marking.
SI ("metric") units are the most commonly used worldwide (see meter and centimeter).
{{Information |Description=Demonstration of thread weight in crochet: three samples of filet crochet in the same pattern with different thread weights. From left to right: size 3, size 10, size 20. A U.S. quarter is included for size comparison. All me