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Self tapping insert varieties. It is a product with internal and external double thread surface structure and thread cutting edge. The product can screw in the screw to apply torque on the inner hole surface of the soft metal substrate, so that all external threads of the product are embedded into the substrate as a whole, thus providing a removable internal thread support for the fastening connection of the screw. According to the difference between through hole and blind hole, it can be divided into through hole type and blind hole type self tapping screw sleeves.