With a roll ball rocking arm and balance tray. It is a smart design and convenient to be installed quickly.

备有流滚珠式驻持摇臂及平衡托架，设计巧妙，安装简便，快捷。

youdao

With a roll ball rocking arm and balance tray. It is a smart design and convenient to be installed quickly.

备有流滚珠式驻持摇臂及平衡托架，设计巧妙，安装简便，快捷。

youdao