You fix a second ball onto this hook.
在这个钩子上挂第二个球。
The steel ball hoist is mainly composed of the tube body and the lift hook.
钢球提升器主要由筒体和吊钩组成。
The arm shaft shaft and hook shaft are supported by ball bearings.
上下轴用滚珠轴承支承，同步齿形带传动。
The arm shaft shaft and hook shaft are supported by ball bearings.
上下轴用滚珠轴承支承，同步齿形带传动。
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