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By certification 
Jiangsu Zhenya Special Screw Co.,Ltd is one of the leading China drywall screws manufacturers and suppliers, as a professional company, our productive factory is able to produce CE certification drywall screws at both high quality and low price. Welcome to buy discount and cheap, or wholesale products from us.
Coarse Thread Drywall Screws have wide-spaced threads and are standard for attaching Drywall to Studs. Fine Thread Drywall Screws have Twinfast Thread
