Usual good quality, additional information would be helpful but

What can I say? My boxes hanging now for a month and have not yet fallen down - and I do not have too little active speakers. The holders therefore function properly and the value for money is really ok since one gets the same 2 pieces brackets.

Helpful A measurement would have been the size of the mounting distance of the bracket to the ceiling must be at least depending on the height boxes. I have the heavy boxes together with the holder must stop troublesome and should not have to drill a millimeter higher because my box now touches to the ceiling: o)

Furthermore, you should definitely consider the following: The rear dock for clamping has a height of about 4 cm. I have eg plugs for audio and power to the box. Then you have to make absolutely sure that the terminals are in the pits higher than 4 cm from the pit bottom. Otherwise you have to, as I help out, with a backing of wood or similar. Works but with a bit of gimmick anyway. If you have terminal contacts the back should not be out there but fold easily, as you can then thread the cables also through the channel provided.