You are buy the micro rod and 90 degree rod clamp kit.
It is used to mount LCD monitor or LED light....
The micro rod features with M12 theaded male and 1/4" UNC threaded on both ends, It can be used to extand the application ( shows as above: A. as micro rod. B. as rod end stop. C.as clamp mount. D.as connector)
Made of aluminum with anodized coating and sand blasting finish.