Stout 13mm hardened steel shackle resists cutting and leverage attacks; vinyl coating offers protection for your bike's finish.  Reinforced, hardened crossbar design provides increased protection.  Disc-style cylinder delivers a high level of security; rotating dust cover helps protect cylinder.  Bumpers reduce rattling noise while you're transporting the Kryptonite KryptoLok Series-2 Mini-7 U-lock.  Comes with 2 stainless steel keys and mounting bracket. 

Kryptonite rates this lock a 6 on their 10-point system with 1 being simple, deterrent security and 10 being extreme security