套钻把不同规格的钻头，放到规定的套装中。以用来加工成套的的孔径。
她怀疑伦纳德故意设了这个套让她钻，他就好像是一个可以提前预想出八步棋的象棋棋手。
She had a feeling Leonard had set up this exchange, like a chess player thinking eight moves ahead.
柄是钻头末端和钻套、主轴或者钻床上的卡盘相配合。
The shank is the end of the drill which fits into the socket, spindle, or chuck of the drill press.
深孔钻有两种类型，即用于钻盲孔的中心切削深孔钻和套孔钻。
There are two kinds of gun drills, namely, the center-cut gun drill used for drilling blind holes and the trepanning drill.
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