1. Self -locked function to secure the safety.

2. Optional for power springs to open the mechanism.

3. Anti-drop metal  slides for easy to close and open.

4. Optional for comfortable seat box.

5. SEC00# doesn't has power springs and seat spring frame to save your cost.

6. Optional for metal seat box for better feeling seat.

7. Storage hinge is for sectional seat, there are 2 or 4 power springs optional. 

Attention: You're s ested to add over-hangings both sides to hide the mechanism .