The upgraded Kryptonite KryptoLok features a double deadbolt design enhancing protection against cuts and twist attacks, making it safer and more resistant. The mini-version is super easy to carry and it includes 4' Kryoflex double looped cable for securing front wheel or accessories. It was designed for quick stops in a metropolitan area, for a couple of hours in suburbs and overnight in rural areas. It features a click shut system mechanism that allows you to feel when the shackle is fully engaged into the crossbar. It also comes with a Transit FlexFrame U-Bracket for versatile mounting on your bike frame. It high security disc-style cylinder is pick and drill resistant and it features a dust cover so no debris or dust can obstruct it. It comes with 2 keys that you can register in their Key Safe program so you can get replacements in case you lose them. They feature an ergonomic design to reduce the amount of torque, thus keeping them from bending and breaking.