它基本上由在淬硬钢衬套下将零件夹持到位的夹持装置组成，钻孔作业中钻头穿过这些衬套，通过它们来导向。
Basically it consists of a clamping device to hold the part in position under hardened-steel bushings through which the drill passes during the drilling operation. The drill is guided by the bushings.
可转位加工工具（切削） 、圆棒、环刀、圆盘形锯、钻孔工具、车刀、导向槽、刀片。
Rotating machining tools ( cutting ), round rods, circular knives circular saws, countersinking tools, turning tips, guide gibs, knive blades.
管束式热交换器。管子分布。管底座钻孔直径。导向扇形块和支承板。
Tubular heat exchangers; tube pitches, diameter of bores in tube sheets, baffles and support plates.
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