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Self -locked function to secure the safety.
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Optional for power springs to open the mechanism.
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Anti-drop metal slides for easy to close and open.
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Optional for comfortable seat box.
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SEC00# doesn't has power springs and seat spring frame to save your cost.
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Optional for metal seat box for better feeling seat.
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Storage hinge is for sectional seat, there are 2 or 4 power springs optional.
Attention: You're suggested to add over-hangings both sides to hide the mechanism