Building_accessories
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Wholesale price of building accessories
And ordinary through the wall screw is different in 1, the middle of the sealing screw is a sealing piece; 2. When disassembling the mold, the ordinary piercing screw is pulled out and reused. The sealing screw is sawed off the outer two ends of the wall, and the middle section is left in the wall to ensure the impermeability of the wall.