Top view of square head set screw.

圆头一字槽螺钉的俯视图。

Top view of slotted head set screw.

埋头一字槽螺钉的俯视图。

Top view of fluted socket head set screw.

圆头一字槽螺钉的俯视图。

Top view of fluted socket head set screw.

槽头螺钉的俯视图。

Set screw?

定位螺栓?。