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Self drilling screws

The screw is a tool to tighten the machine parts step by step by using the physical and mathematical principles of the oblique circular rotation and friction of the object. The drill tail screw is a screw with a self-tapping drill head at the front of the screw. Screw is a common invention in people's production and life for thousands of years. According to the application field, it is the first invention of human beings. Drilling tail screw is a new invention in recent years. It is also called self-drilling screw.