The AXA Defender RL frame bicycle lock is a tough, sturdy, and heavy-duty lock that can be installed directly onto most bicycle frames. The Defender RL frame lock is simple to use in everyday situations. With its simple turn of a key, lock and go functionality, you will be locked and on your way in a breeze. This frame lock is key operated, and stand alone; it locks the bicycle by engaging a steel ring through the spokes of the rear wheel, effectively immobilizing the bicycle. With optional plug-in cable* or plug-in chain* (sold separately), the Defender RL can lock both the wheel and the bicycle frame to a bike rack, or a secure object. For those times when you need to lock the bicycle to a rack, or other stationary object, the optional plug-in chains* and plug-in cables* are very beneficial because they create a full, secure locking system. Using the Defender frame lock is very straightforward. When locking the bicycle it can be done in one of two methods: (Method 1) Alone, simply th