Door Cylinder Biased Lock 65 70 80 90 115mm Cylinder AB Key Entrance Brass Door Lock Lengthened Core Extended Keys

Instructions for the Use of A.B LocksA.B lock is a special new type of anti-theft lock designed with the theme of master safety.1. B key is provided for house decoration workers.2. A key is encapsulated in plastic package. Before the house is decorated and finished, the owner should not try to open it with A key, so as not to cause unnecessary trouble.3. After the decoration of the house is completed, the owner accepts it for the sake of completeness. Take back the B key in time, and then insert the A key into the lock core to rotate 360 degrees, the B key will automatically fail.Name: Copper lock core for burglar-proof door