The Kryptonite Evolution 1012 Intrgrated bike lock is made from 10mm hardened steel chain links in a six-sided design. Designed with e-bikes in mind, offering extended length and added security to suit your needs. It features a patented reinforced oval crossbar lock head and equipped with a high-security disc-style cylinder resistant to picking and drilling. The patent-pending end link design securely connects the chain to a hardened deadbolt, eliminating potential weak points. A durable rubber coating around helps prevent scratching and wear and tear on your bike. A Sliding dust cover protects and extends cylinder life, while a durable weather-resistant nylon sleeve prevents scratches. Kryptonite will ship your first 2 keys for free, globally, in the event you lose them. Register your unique key code on our website so you can order new keys if you ever misplace them.