DESCRIPTION:
These are a comparison video on different chain sizes.

Italian Box Chain: 1.2mm W / 22inch L
Franco Chain: 2.65mm W / 26inch L
Curb Chain: 6.7mm W / 24inch L
Pendant: 21mm L / 15.5mm W

Links:
Italian Box Chain:
http://www.ebay.com/itm/380713961920?_trksid=p2057872.m2749.l2649&var=650136331376&ssPageName=STRK%3AMEBIDX%3AIT

Franco Chain, Curb Chain, and Pendant:
https://www.northjewellery.com/