countersunk造句
        Countersunk rivet symbol. Use in conjunction with other rivet ends.
埋头铆钉符号. 与其他铆钉端点结合使用.
Side view of raised 
countersunk slotted screw with adjustable thread length.
螺纹长度可调整的半埋头一字槽螺钉的侧面图.
Side view of 
countersunk posidriv screw with adjustable thread length.
螺纹长度可调整的埋头十字槽螺钉的侧面图.