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copper bolt

Screws are indispensable industrial necessities in daily life: such as minimal screws used in cameras, glasses, clocks and watches, electronics and so on; general screws used in TV, electrical products, musical instruments and furniture; large screws and nuts used in engineering, construction and bridges; and large and small screws used in transportation equipment, aircraft, trams and automobiles. The screw has an important task in industry. As long as there is industry on the earth, the function of the screw will always be important.