High quanlity roller doors fast speed Alibaba China pvc shutter on China WDMA color:Black the torque resistance of the

the torque resistance of the profile itself

Aluminum thickness

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High quanlity roller doors fast speed Alibaba China pvc shutter on China WDMA color:Black the torque resistance of theHigh quanlity roller doors fast speed Alibaba China pvc shutter Product Description 1) The door body structure Track uses the high strength harden oxidation resistance industry aluminum alloy guide rail, the surface after oxidized frosting processing; The door uses the cold rolling steel plate structure, after rust prevention processing, the semblance after 250 high tepid stove powder spray coating processing, the color is sharp, guards against