Sold Secure Gold rated The Kryptonite Evolution Series 4 chain lock is very strong for its size and weight for use in moderate to high crime areas. 10mm hardened triple heat-treated boron manganese steel chains offer excellent resistance from a range of attacks. Kryptonites Evolution integrated lock comes with 3 stainless steel keys of which 1 has an LED light to help you lock your bike in the dark. A very impressive bike lock thats very popular in the cycling community. Key Features: Sold Secure Gold ratedThe 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 sleeve to protect paint from scratches and allow for easy portability and tight coiling during storageComes with 3 stainless steel keys including a lighted LED key with replaceable battery and 2 new ergonomic ’I’ keysOne key is lighted for easy access at night; replaceable battery insures that light can be used as long as the lock. The new ’I’ keys make opening a disc-style cylinder much smoother Specifications: Product dimensions: 21.5” (55cm) chain lengthProduct weight: 4.40 lbs (2.00 kgs) Additional Features: Key Safe ProgramLimited Lifetime WarrantyKryptonite Anti-Theft Protection offer up to £2 000 when registered