a pointed and threaded tool for drilling and boring that is secured in a brace, bitstock, or drill press
曲柄, 钻柄或钻床之上用于钻孔的尖头工具
A pointed and threaded tool for drilling and boring that is secured in a brace, bitstock, or drill press.
钻头曲柄，钻柄或钻床之上用于钻孔的尖头工具
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