Top view of square head bolt.

方头螺钉的俯视图。

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Side view of square head bolt with adjustable thread length.

螺纹长度可调整的平头一字槽螺钉的侧面图。

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Side view of square head bolt with adjustable thread length.

螺纹长度可调整的平头一字槽螺钉的侧面图。

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