For a while I had been hesitating between several brands to choose a filter holder for ND and GND filters. I took advantage of a flash sale to buy this kit. I am not disappointed.
The set seems sturdy and easy to store.
The case, quite pretty, has 5 compartments, 3 of which, for square ND filters, are raised via a ribbon. On the back of the case, there is a belt loop and a belt loop. I would have liked a slightly more spacious compartment to house the adapter rings with the CPL filter when it is removed.
The assembly (or disassembly) of the elements is well explained in instructions in several languages, including French.

Main positive points:
No dominant color, nor loss of sharpness on the first tests carried out.
The plastic frame with its tabs to handle ND filters.
The system for installing the PLC filter on the filter holder.
the knurled button for mounting the adapter ring and for rotating blocking the filter holder.
The very accessible wheel to control the polarizing filter.
The sturdy holding of the square filter on the filter holder.
The robustness of the metal filter holder.

If you have to find slightly negative points: Keeping
the square filter a little too sturdy in the filter holder.
The click too loud to lock the CPL filter in the filter holder.
No pouch to independently protect the CPL filter in the case.
No protective cover for the CPL when the set is installed on the lens.

I use it for long exposure photography.

I've used the filter several times and it works great plus the mount works great and have already used other filters with it...

Great value for money!

I recently purchased this set of filters for my Nikon camera but they also fit other brand cameras I own. That is a huge plus for me. For the money, this filter set perfectly meets my needs. This set is good quality, comes well packaged and arrived in perfect condition. I would recommend this set to others.

I am an amateur and gathering my gear little by little. I bought several K&F items and I have to tell, these guys put love on what they do. Any detail es great, the metal parts are fine, the mobile parts works perfect. A great maker!

Nothing short of delivering its single purpose in life.

Well maid and makes handling the filters easier

I used for add on my phone cam use , wish goes far beyond what i need ,also for my main cam Tamron lens which all has 67mm filter & very well enginer & made

I have to say I'm a newbie and haven't learned much yet.

The 1st thing is a pity for the 49 mm lens (Sony) there is no suitable adapter in the set, I have to buy an extra 49 mm adapter ring, which is why I gave it 4 stars, because it otherwise makes a good impression, but I still have to familiarize myself with it.

Great value. Filters fit snug and don’t let any light around them. Filters come in a quality case.