◎ Excellent physical property: Integrate construction,high intensity. ◎ Good corrosion resistance. ◎ Easy installation: Duct with multi-hole makes installation easy and convenient, and reduce the costs at the same time. ◎ Environment-friendly: This product does no harm to the environment and can be recycled. ◎ Long service time. ◎ High efficiency: Each hole rank tightly, improve the utilization rate of the communication hole.