Have 4 of these small spherical head joints ordered and am pleasantly surprised at how stable and robust they are. All vital parts are made of metal and in addition is still each a hex key and a matching set screw attached. Of course, such a mini ball head is not for the cameras and other x-kilo heavy equipment. I use them for LED headlamp with 600 LED / 1 kilogram of weight and pull the screw only so tight that the Panel indeed fixed, but are still aligned - that works perfectly. The weight limit I would pull at 1.5 kilograms. By puzzling out the best offer (combination of product price + shipping) I have for the 4 ball head joint total only 20.50 paid, this value is unbeatable in my opinion!