The master lock excell black finish combination padlocks are made with cutting edge technology to deliver unprecedented security featuring tough cut patented octagonal boron carbide shackles which are tough to cut it has a 4 digit resettable combination with up to 10000 possible combinations and is easy to reset no reset tool needed the angled dials with blind use feature are practical and easy to use the roller pin locking mechanism delivers an exceptional level of resistance to pullingprying