The Kryptonite Evolution Series 4 1090 chain lock is a truly exceptional mid-range security system for moderate to high crime areas. Each hardened triple heat-treated boron manganese steel chain is 10mm thick and six sided - you won't find better at this price point.Nylon webbing is a great feature on the Evolution Series 4 as it protects your paint work from getting scratched and helps make portability easier. The chain lock comes with 3 steel keys, one of which is a lighted LED key - making night time locking much easier.Key Features:The hardened triple heat-treated boron manganese steel chains include 10mm six-sided linksThe integrated chains secure with a new patent-pending integrated Evolution series 4 lock headThis innovative series of chains also feature a patent-pending pin-less design which secures the chain to a hardened deadbolt and allows for no weak leak in the chain due to extensive holding power of the link itself against attacksChains are enclosed in a nylon-webbing sle