Chains are a pain to cut because they shift and don't offer good leverage for a thief, so the ABUS Steel-O-Chain 6800 chain lock is exactly what you want to help keep your bike secure.
Features
It comes with 2 keys, so you can keep one at home in case your keychain goes MIA
8mm square, hardened-steel chain links are strong and durable
Pinned fabric sleeve protects your bike frame
Chain and lock body are made of hardened steel
High corrosion resistance ensures years of service