I was able to test the K&F suction cup mount as part of the Vine program, as I have a lot of work to do in the photo and video sector, the offer was very convenient for me! The holder arrived at my home clean and well packaged, and I would have expected nothing else from K&F. The holder must be assembled in a few simple steps before first use, the composition is actually self-explanatory and a small Allen wrench is included in the packaging. Instructions are also included for anyone who doesn't get along. The suction cup holder itself is made of aluminum, the threaded holes are also made of metal. A mount for the most common action cams and a mobile phone holder which, in my case, can hold the Samsung S24 Ultra loosely are also included. The mobile phone holder can be opened so that even small tablets can be held. Surprisingly, the suction cup not only sticks to mirror-smooth surfaces, but also to somewhat rough surfaces or to wood when painted. Be careful with car windows as they are usually slightly curved, so you should check from time to time that the vacuum is held to hold the bracket. I noticed that the car had worn off a bit over time, not that the bracket had fallen off, but I had to inflate some negative pressure. While we're at it, the bracket is held with a small pump button which creates a vacuum under the suction cup. A small mark on this button indicates whether there is adhesion or sufficient vacuum. If the mark becomes visible, you should act quickly so that the holder does not fall off. Otherwise, when everything fits, the bracket is bomb-proof, so you won't easily tear it off anymore. To release the holder, there are 2 thickenings on the top of the suction cup which you have to press together slightly to ventilate the vacuum. The suction cup can then be removed. As already mentioned at the beginning, you can attach all types of cameras or even lights that have a 1/4" thread or recordings like GoPro to this mount. There is even a hot shoe embedded in the cell phone recording, on which video lights or microphones can also be mounted. Even small SLR cameras can be mounted and held securely. On the other hand, I would not install larger cameras, I suspect that the leverage would then be too great and the mount would yield and fall off in the worst case. Everyone should know how much such cameras cost. I am very satisfied with this mount and give it 5 stars, it has served me faithfully even on vacation and has not disappointed me in any way. I would say the price-performance ratio is right and so is the quality.