The Kryptonite KryptoLok Standard U-lock is an excellent choice for cyclists who are looking for a high-quality lock to protect their bicycle against theft. The lock has a 13mm hardened steel shackle that is resistant to cutting and leverage destruction and comes with a flex cable. It is recommended for medium-high theft hazard areas, with a security rating of 6/10. Every manufacturer gives their locks a number – that's why this lock is more secure than other brands with a higher number. It has been awarded the Sold Secure seal (Silver level) by a more independent organization. The flex cable allows you to secure the front wheel of your bicycle for an extra security function. We recommend always using the U-lock, not the cable itself. This cable is only an addition to the lock