The Kryptonite KryptoFlex 1018 Key bike lock is a flexible braided steel cable 10mm thick with a protective vinyl cover that provides greater resistance to cutting attacks. The lock head rotates 360 degrees for easier handling while locking up and removal. The opening and closing system is an easy-to-use reversible key. The manufacturer gives it a security rating of 1 out of 10 and offers convenient deterrence against theft. MORE INFORMATION: How to choose the best lock to protect your bike?