1. First, prepare a set of door locks, then find the small hole of the handle, tap the locating piece on the small hole with a tool, and then open the handle.

2. Secondly, remove the fixing ring on the handle by rotating. Then install the lock tongue in the tongue hole and fix it with screws.

3. Finally, insert the lock body into the lock hole. At this time, it is necessary to use the external handle to fine-tune the position of the lock body so that the lock body is on the center line of the door.

4. Then put on the inner handle fixing ring, fasten it on the lock body with screws, and then put on the inner cover ring.

5. After that, install the inner handle in a fixed position, and tap the locating piece at the small hole with pliers to push the inner handle in. Reinstall the lock box, and pay attention to let the locking tongue completely enter the lock when installing.