... products: garage door, industrial door, crystal rolling door, rapid speed rolling door 1. Using hot-dip galvanized steel sheet as door planks, pressing ... pattern and bar reels on the surface, inside the door plank is foamed pur, solid, heat preservation, soundproof ... lingevity torsion or extension spring to balance door´ S weight, reduce motor´ S load. Door up and door eaily with remote, electricity ...