A pointed and threaded tool for drilling and boring that is secured in a brace, bitstock, or drill press.
通常是尖头的有螺旋状图案并且可以更换,
在钻柱钻
或钻床上。
钻的)钻
A pointed and threaded tool for drilling and boring that is secured in a brace, bitstock, or drill press.
通常是尖头的有螺旋状图案并且可以更换,
在钻柱钻
或钻床上。
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