Ultima 420 exudes a sense of security just by its appearance. There are locks, and then there is the Ultimate 420, so if you're looking for a lock that deters potential thieves just by looking at it, look no further. Thirteen millimeters of hardened special steel and the aggressive color scheme immediately make it clear to any bike thief that they are out of their depth here. Moreover, the Ultimate 420 is so compact that you can easily stow it away. It fits in any backpack or bag, so it's always with you when you need to secure your valuable bike.