The Evolution Mini-5 U-Lock offers tough security in a compact design that fits in your pocket. The 12 13 mm through-hardened Kryptonium TM Steel shackle resists bolt cutters and leverage attacks. New and Improved high security disc style cylinder can’t be opened with a pen. 3 keys – one lighted for nighttime use. Includes versatile EZ Mount transportation bracket that reduces rattle in transport.