square head bolts
... 六角木牙螺丝HEX LAG BOLTS 四角螺丝SQUARE HEAD BOLTS 马车螺丝CARRIAGE BOLTS ...
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四角头固定螺丝 SQUARE SET SCREWS ; SQUARE HEAD SET SCREWS
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嵌入式安装：直接使用4个M6的螺丝固定在灯具四角的安装螺孔固定灯具。
Embedded installation: direct use 4 screw in the M6 with the four corners of the lamps and lanterns of fixed screw holes installation lamps and lanterns.
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