The kryptonite new york m18 lock is the highest security lock on the market approved by thatcham cat3 and passed tests by ffmc and classe sra the innovative design of this d lock proves impenetrable against commonly used tools and leverage attacks the d lock is crafted from hardened steel and features unique locking mechanisms for added protection the kryptonite new york m18 lock will prove durable due to its strong vinyl coating kryptonite new york m18 lock features passed following test