v.张扪孔口；钻孔装埋；打埋头孔
n.皿锥；埋头孔；暗钉眼
A tool for making a countersink. 做螺丝钉孔的工具
To drive(a screw or bolt) into a countersink. 将钻或螺栓置入埋头孔
Orthopaedic instruments.Drills, taps and countersink cutters for use with osteosynthese screws with asymmetrical thread and spherical under-surfaces. 外科医疗器械.
Keywords countersink diameter;peg;grip; 钻孔直径;销钉;握着力;
drill and countersink combination 尖角钝角两用钻
