The screw is the use of the object's beveled circular rotation and friction of physics and mathematical principles, step by step
fastening tools.Drill screw is a screw with a self-tapping drilling head at the front of the screw.Screw is a common invention in
people's production and life for thousands of years. In terms of application field, it is the first great invention of human
beings.Drill screw is a new invention in recent years, also called self - drilling screw.Screw is the general term of fasteners, the
daily colloquial language.
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