flat drill bit
... twist*flat*drill 麻糖平钻 flat drill bit 扁钻头 twist flat drill 麻花平钻 ...
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槽形扁钻头 [木] bobbin bit
扁头小钻 FLAT AWL ; BRAD AWL
大扁头钻尾螺丝 Truss head self-drilling screw
扁销孔钻头 cotter-hole drill
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冲切成槽薄壁混凝土防渗墙施工技术是在原冲击成槽建造防渗墙的基础上，对冲击钻头和施工工艺加以改进，用扁钻头代替十字钻头，用正反两种循环系统进行泥浆循环的一种新防渗墙施工方法。
The present technique is a new thin cutoff wall construction method by modifying the original method as to use flat drill bit instead of cross bit and adopt positive and negative circulating system.
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