USE CAUTION
1:B keys are used some others persons;
2:The key C and A keys is used Masters,
Bosses and Landlords;
3:The key C is put into the lock body and
circulation,B keys are invalidated.
MARK
1:Please inspect A keys and the key C of
all validity;
2:Before the master using it,it's taboo to
attempt to use the key C to open the lock.