I bought them to mount umbrellas on lights. The build quality is very good, really sturdy and durable. My problem is that the accessory it comes with (the silver one), if placed properly inside the socket, the part that sticks out is only enough to use the screw it has. For me, this is useless as I am trying to mount lights on top that have the classic base, so I would like it to be double the size so that the light can also be screwed on. I would like the relevant accessory to be included as well, as I am not even sure how to search for it to buy it separately. Other than that, I am very satisfied, especially with the build quality.