black gypsum screw

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  • Post time: 13-06-24


  • Post time: 24-10-22

  • Positive twist: Twist two or more pieces of wire into a double wire rope and then wrap the wire around the double wire. It’s called a positive twist cord which is a common double strand cord.

  • In addition to these reasons, we should also pay attention to the tooling and process must be stable, and regular testing should be done to ensure the uniformity of galvanized layer.

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