After the fixing bolt is completely screwed in the central hole of the screw, the upper end-face of the fixing bolt is lower than the upper end-face of the fixing sleeve pipe.

固定螺钉完全旋入螺杆中心孔后，固定螺钉的上端面低于固定套管的上端面。

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After the fixing bolt is completely screwed in the central hole of the screw, the upper end-face of the fixing bolt is lower than the upper end-face of the fixing sleeve pipe.

固定螺钉完全旋入螺杆中心孔后，固定螺钉的上端面低于固定套管的上端面。

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