Broughton countersink
布劳顿锥坑钻
To drive into a countersink.
将钻或螺栓置入埋头孔
A tool for making a countersink.
做螺丝钉孔的工具。
drill and countersink combination
尖角钝角两用钻
Drill and countersink the holes to keep wood from splitting.
钻和锪孔，以保持木材的从分裂。
Improvement and optimization of titanium alloys countersink drill.
钛合金锪钻改进与优化设计
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