Loosen the bolt so the bars can be turned.
松开螺栓，这样那些木板就能被翻过来了。
The design of the bolt head insures that the bolt will not slip or rotate when the rubber is turned.
这种设计确保了在旋转橡胶的时候螺栓不会滑动或旋转。
Fastened with eyelet bolt, it can be turned on quickly, installed and maintained conveniently.
采用活节螺栓紧固，能快速开启，便于安装与维护。
Fastened with eyelet bolt, it can be turned on quickly, installed and maintained conveniently.
采用活节螺栓紧固，能快速开启，便于安装与维护。
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