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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. 使用時，將左鏇絲錐 放入鑽好的斷骨的鑽孔中，左鏇轉操作即可，鉸制出左鏇內螺紋。 ip.com