The square-shaped middle part of the main frame is matched mutually with an internal telescoping rod (square) to hold the screws to prevent the screws from rotating.
主架中部是正方形的，和内部的伸缩杆(正方形)相互配合，顶住螺丝防止其旋转。
The square-shaped middle part of the main frame is matched mutually with an internal telescoping rod (square) to hold the screws to prevent the screws from rotating.
主架中部是正方形的，和内部的伸缩杆(正方形)相互配合，顶住螺丝防止其旋转。
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