For 2 reasons : 1. Every mechanical lock can be opened using a tool called ITL2000. It is a robotic arm that tests all the combos of the mechanical lock. 2. T

For 2 reasons : 1. Every mechanical lock can be opened using a tool called ITL2000. It is a robotic arm that tests all the combos of the mechanical lock. 2. The maintenance of codes in a bank using mechanical locks is very complicated and costly. When the person in a branch who knows the combo takes holidays a locksmith has to go to the branch to change the combination, for example. In an electronic lock (SG-6121) there are the master code and 9 codes, one of them opens the lock without waiting for the delay.