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Product instruction:hex head flange self drilling screw   drill their own holes when they’re screwed into materials such as wood,Website:http://www.nbzhencheng.com, plastic and metal. By using a screw driver to attach a self tapping screw, you can create precisely fitted threads. They're ideal for combining two different types of materials or for screwing in areas where access is only one-sided. It’s helpful to use self tapping screw for products that need to be maintained regularly, such as air-conditioning units or canopies, where you need to dissemble and reassemble the item along the same