Based on the legendary Evolution Mini-5 U-Lock, the new Messenger Mini has a wider and longer shackle to increase the number of places it is possible to lock your bikeBut it still fit's in your back pocket!The MAX-Performance steel shackle allows for a reduced diameter, while maintaining the same security as the Mini-5Durability has been increased with the addition of the new disc style cylinder - featuring anti-rotation discs - reducing the chance your key will get stuck or break in the cylinderSupplied with keys on a convenient wrist bandAlso included are the Kryptonite Security WheelNutzUse the WheelNutz to secure your front wheel, while using the Messenger Mini to secure your rear wheel and frameWhen WheelNutz are installed your bike must be turned upside down to remove the wheel - if your bike is secured to something your wheel can't be removedDimensions: U-Lock - 9.5 cm x 16.5 cm (3.75 in x 6.5 in), WheelNutz - M9 axle