First confirm the thickness of the glass door. Generally 10-12mm. Then select the position you think is suitable on the glass door. Fix the glass. Adjust the lock tongue. Make the switch turn clockwise. Tighten the screw behind the lock. The installation is complete. (Double side glass door lock should be used with glass bolts) Note: If the project requires glass openings, replace the extra spare screws and pass through the glass on the spare holes until they are tightened.