A pointed and threaded tool for drilling and boring that is secured in a brace, bitstock, or drill press.
通常是有螺旋状图案并且可以更换,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.
通常是有螺旋状图案并且可以更换,在钻柱钻柄或钻床。
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