Hex Combination Screw

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In fact, a combination of screws is a screw, but a special point, the general is the three components or two components, but at least two components can be called the combination of screws. And the difference between the ordinary screw is more than the average screw with a spring pad or more with a flat pad, or is the three components, and more with a spring pad. This is the most important difference between the appearance of the combination screw andordinary screw.