Black cap to place on a built-in flash. You can often find these kinds of blinkers in desk lamps and wall lamps.
The internal thread of the black cap: M10x1.
internal thread: M10x1
|Dimensions (cm):||internal : 1.0 , M10x1 (0.39 inch)|
|Heigth (cm):||0.8 (0.32 inch)|
|Outer Diameter (cm):||1.2 (0.47 inch)|