countersink

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countersink
countersink

countersink
countersink dot
暗钉眼孔
Drill and countersink the holes to keep wood from splitting.\x09
钻和锪孔,以保持木材的从分裂.

埋头孔点。。。

countersink 英语翻译countersink all tapped holes approx 90度 included angle to a dia 0.3 to 1.0 greater than major dia of thread.