平面、外圆、内孔、凹槽及其他较难测量的表面。
Plane, outer circle, inner hole, groove and other surfaces that are difficult to measure.
每个滑动安装一块半圆形凹槽面向通孔。
Each sliding piece is installed with semicircular grooves facing to the through hole.
本实用新型涉及一种可以钻左旋丝孔的骨科医用左旋钻头，它是在一个金 属钻杆上镂刻有左旋凹槽。
The utility model relates to a medical orthopaedics left-hand drill bit for drilling a left-hand thread hole. A metal drill rod is carved with a left-hand groove.
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