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poeppelman fasteners cut one or more cutting edges at the end of the thread, allowing them to cut matching internal threads in a manner similar to a tap when screwed into a pre-drilled hole, utilizing the tail and threads of the screw. They can be used on thick plates, relatively hard or brittle materials that are difficult to form. Self-tapping screws are screws with a drill bit tip; construction is performed using specialized power tools to complete drilling, tapping, fixing, and locking in one operation. Self-tapping screws are mainly used for connections such as joining color steel sheets to each other and fixing them to purlins, etc. These self-tapping screws are often exposed to the outdoors.