左旋螺纹 left hand thread ; LHT ; hand screw ; thread
左旋螺纹[钉 Left-hand screw ; hand screw
左旋螺纹丝锥 left-hand thread tap
左旋螺纹手控丝锥 left-hand thread manual tap
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使用时，将左旋丝锥放入钻好的断骨的钻孔中，左旋转操作即可，铰制出左旋内螺纹。
When used, the left-hand tap is put into a drill hole of a drilled broken bone, and then operated by a left hand to make left-hand internal threads.
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