A pointed and threaded tool for drilling and boring that is secured in a brace, bitstock, or drill press.
通常是尖头的有
图案并且可以更换，
在钻柱钻柄或钻床
。
A pointed and threaded tool for drilling and boring that is secured in a brace, bitstock, or drill press.
通常是尖头的有图案并且可以更换，在钻柱钻柄或钻床。
：以
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