顶部M4螺纹孔
20-50 mm，每1 mm一个高度可选
横向Ø3.2 mm贯穿孔，用于加固/松开安装
节省选购及组装时间，光机系统搭建简便快捷
配套光学接杆直径12.7 mm，顶部带M4螺丝
有安装座、360°连体旋转压块、叉式压块三种固定方式可选
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