More useful than a U-lock
"With bike thefts seemingly on the rise, I got this KryptoLok chain to supplement my KryptoLok U-lock. Sometimes it's a lot easier to thread this chain through a wheel and frame than to wrestle with a U-lock that may or may not fit. I can't judge the security of the KryptoLok chain, but Kryptonite says its the same 6/10 as the KryptoLok U-lock. The big drawback of this chain is just the weight."