After 40 years as a leading manufacturer of locks, Kryptonite introduced in 2012 an innovative new range of chain. These new chains Evolution Series 2, are the perfect combination of portability, comfort and maximum protection for your bicycle.The Kryptonite Kryptolok series 2 Mini 7, U-lock is composed of a13mm think cylinder. The manufacturer gives it a security rating of 6 out of 10, indicated for areas of moderate theft. MORE INFORMATION: How to choose the best lock to protect your bike?