The Kryptonite Kryptolok 912/917 chain lock is a sturdy ART2 lock which you can use to safely lock up your e-bike, city bike or cargo bike at an average theft risk. It'll make life a lot harder for bike thieves with its smart and innovative design! Average theft risk The chain of the Kryptolok consists of square, 9mm links, made of 3T manganese steel. The End Link and Deadbolt Design ensure that the last link isn't the weakest, as is the case with many other locks. Plus, the disc-style cylinder is pick and drill resistant. To top it all off, the links are equipped with a weatherproof nylon cover that makes sure the lock won't scratch up your bike. Keys and Key Safe Program This Kryptonite chain lock comes with two ergonomic 'i'-keys. Should you lose one, you can easily request a new one via the Kryptonite Key Safe Program, if you've registered your lock!