- pilot bit
- 前导: lead the way; march in front ...
- 钻头: boring crown; bore bit; dril ...
- 前导: 1.(在前面引路) lead the way; march in front; precede2.(在前面引路的人) a person who leads the way; pioneer; guide 以仪仗队为前导 with the guard of honourmarching at the head; 前导轮 front jockey wheel
- 钻头: boring crown; bore bit; drilling bit; [机械工程] bit (of a drill) 三牙轮钻头 three cone bit; 卸下钻头 break out a bit; 装上钻头 brace a bit
- 电锯心轴及导钻: electric hole saw mandrel with pilot drill
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