Master Lock 8143D Combination Bike Lock, 4 ft Long, Black Bike lock is best used for basic security as a theft deterrent Preset four-digit combination bicycle lock for keyless convenience; combination cannot be changed Bike lock cable is self-coiling and features braided steel for strength and flexibility Protective vinyl coating prevents the cable from scratching your bike Bike cable lock is 4 ft (1.2 m) long with 5/16 in. (8 mm) diameter cable (includes vinyl coating)