It is practically the full diameter of the drill and extends the entire length of the flute, its surface being a part of a cylinder.
它实际是钻子的充分的直径并且扩大长度的凹槽，它的表面是圆筒的零件。
It is practically the full diameter of the drill and extends the entire length of the flute, its surface being a part of a cylinder.
它实际是钻子的充分的直径并且扩大长度的凹槽，它的表面是圆筒的零件。
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