Using this Oxford D - lock is easy. First, set your 4 - digit combination as per your preference. Then, loop the 12mm shackle through your bike's frame and wheel or through a bike rack. Close the lock and you're good to go. The carry bracket allows you to conveniently attach the lock to your bike when not in use. When it comes to maintenance, keep the lock dry and clean. Avoid exposing it to extreme temperatures. If the combination mechanism seems stiff, you can use a small amount of graphite powder to lubricate it. Remember, the vinyl cover protects your bike's paint, so don't remove it. Also, make sure to choose a well - lit and secure place to lock your bike to enhance security.