As the teeth on the inside of the slips grip the pipe, the slips are pulled down.
当卡瓦内表面的牙齿抓住管子后，把卡瓦向下拉。
A mounting hole for arranging the high strength friction grip bolt is arranged at the top of the rectangle steel pipe column.
所述的矩形钢管柱的上部开有用于安装高强螺栓的安装孔。
A mounting hole for arranging the high strength friction grip bolt is arranged at the top of the rectangle steel pipe column.
所述的矩形钢管柱的上部开有用于安装高强螺栓的安装孔。
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