security

[fazersharp]

[quote author=fazersharp link=topic=20173.msg233479#msg233479 date=1465034598]
You need 19mm chain links as that way the biggest bolt croppers jaws will not open wide enough to get on to it.

chain that's hard to cut with bolt cutters up to 1 meter long
[/quote]
Yes that is the factor when thinking about the practicality of carrying a 19mm chain, the thinking is that you go for a smaller chain but only small enough so that only a bolt cropper over 1m will cut it. And that thinking is that Its difficult to hide a 1m+ bolt cropper down your trouser leg.  :eek

But beware of cheaper fully hardened chains because when one side of a link is bolt cropped the shock actually breaks the other side because that chain is brittle, that is where you will of come across the term "case hardened" so the link is softer inside and so will not shatter - which means they have to bolt crop both sides of the link- takes longer.