China high quality hex head screw factory screw manufacturer drywall screw self drilling screw

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This is our hex washer head screw factory. The production of screws goes through many steps. We pay great attention to it from the first step of raw materials. In each step of the production process, we have a dedicated person in charge, and after the screws are made, they must be tested for quality. If you are interested in our products, please contact me.
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