1. When the folding ladder is locked, the ladder spreads outward, and then a click is heard, indicating that the lock block has entered the specified position and the hinge has locked this position.

2. When unlocking, pull the handle to unlock, and then the lock block will reset, indicating that the lock has been opened. At this time, you can change the angle of the ladder or close the ladder.

3. When the folding ladder is put into use, carefully confirm that all joints are locked before climbing the ladder.

4. The folding herringbone ladder less than or equal to 4 meters can be unfolded and used as a straight ladder, but the included angle between the ladder and the ground should be greater than 75 degrees, and the instructor of the ladder should face the wall.

5. When the folding ladder is used as a platform, at least a flat plate with a thickness of 1cm should be padded.

6. When someone is working on the ladder, it is forbidden to pull the handle to move the locked state of the ladder hinge.