| Level |
A |
B |
B+ |
| Technical-open resistance　 |
with in 1min |
within 5 mins |
270 mins |
| Mutual unlocking rate |
Higher |
High |
0 |
| Composition of the pins |
1 row of pins or cross key |
double rows of pin |
double rows of pins + 1 row of slot pins |
| Pins type |
common pin |
common pin |
special pins in different shapes |
| Work theory of the pin |
equalizing force and work in step |
equalizing force and work in step |
disequilibrium force and step control |
| Key tape |
cross key or flat key |
flat key |
Unique key design with doulbe lines teeth |
| Safety |
easy key duplication |
easy key duplication |
Masterkeyed design with the key order card, high difficulty key duplication |
| Patent |
few |
few |
around 20 National patent |
