Destruction:

The fast belock function: can turn the handle for 40 degree inside or outside to lock the main tongue fast. (Deduct the trouble of lock or open the door with the key)

The fast opening function: can turn the handle for 40 degree to open the diagonal lock, safety tongue and main lock tongue when the key insurance isn’t opened.

Key insurance function:

Can open the key insurance by turn two and a half circles inside or outside in key (you will hear a voice like “ka”). The inside handle can not open the lock urgency when the key insurance is opened.