Disc lock with case hardened 12 inch kryptonium steel shackle for maximum security14 mm hardened max performance steel shackle resists cutting and leverage attacksdouble deadbolt locking mechanism for extensive holding powerhigh security disc style cylinder with more then a million key variationsreinforced anti drill anti pull cylinder protection systemsliding dustcover protects and extends cylinder life3 keys one lighted with high intensity bulb and replaceable batterycolour black with white