The commonly used industry standard lengths for men's necklaces are 18 inch, 20 inch, 22 inch, 24 inch. The best length for a men's chain is 20 inch which is the most popular length for men. If you are just starting to try to buy and wear necklaces, or if you are a female friend who wants to buy necklaces for men, you may be confused about which size to choose.
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