Disc lock with case-hardened 1/2 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 graphics