Features
Set the adjustable button to the original not open state before using, and then follow the first step A.
Next step B, pull the inner tube and make the door bar setting on both side of doorframe then push forward the tube to find a closest fixed hole.
Following the step C to set bolt to the fixed hole and put the fixed cap.
The final step D, turn the adjustable button (3.5cm is the maximum adjustable distance) tomake the door bar fixing on the doorframe and locking it tightly then settle the safe stand under to prevent the door bar falling down.