Folding lock with high security for all cyclists. 6 mm hardened steel links for secure locking. Includes an easy-to-attach transport bracket. Key Safe program. Includes 2 keys. Lock type: folding lock. Locking system: key. The Kryptonite KryptoLok 685 folding lock is a solid and reliable security solution. It consists of 5 mm thick hardened steel links for strong protection against theft. Additionally, it can be easily transported in the included bracket, which can be mounted effortlessly. With Kryptonite's Key Safe program, you can easily request a replacement in case you lose your key, provided you have registered your lock. Furthermore, Kryptonite offers its customers the Anti-Theft Protection Offer (ATPO) on certain models, a program that compensates registered buyers in the event of bicycle theft due to lock tampering.