very easy to use

Takes a bit of getting used to but the value of a top quality holder, ND filter and a circular polariser complete with several adaptor rings makes this a bit of a bargain. I can even use it on my 14-30 NIKon Z Len’s at 14mm without vignetting once positioned correctly. Pretty impressive bit of kit. The ND is excellent and neutral. Recommended!

I mounted the kit on a lens with the 72 mm ring and it fits perfectly. It's easy to assemble and its operation is very simple, it doesn't require reading the instructions (I'd say it's better not to read them) just seeing the illustrations is enough. As for the quality of the product, it seems to be made with good materials and the finish is excellent; the polarizing filter holder is very effective, placing the filter well and with care and you don't touch it at all. There are two compartments for the square filters that I hope to get the most out of, I'm happy.
As for the optical quality of the filters, I can't comment because I haven't used them yet.

The rectangular filter is the ideal choice for landscape and architecture photographers.
I myself use a Nikon D4 with an AF-S 24-70 2.8 Nikon lens to test this filter extensively, unfortunately the weather is not that great at the moment but you can already tell a big difference.
Of course you can also say that a simple polarizing filter would be sufficient to be able to display the colors true to nature and without reflections, but with this filter you have even more possibilities to display the horizon more brilliantly. The CPL filter is screwed in behind the rectangular filter and can be adjusted from the lens side using an adjustment wheel with a ribbed surface.
The CPL filter can be adjusted super to increase the exposure time without getting a crossfade of the image.
The rectangular filter holds well in the frame.
With the system, the rectangular frame can be easily removed.

Very high quality ND1000 K&F Concept square filter set consisting of glass filter, filter holder and lens adapters for the filter holder.

The package is divided into 3 parts:
1. a bag with metal adapter rings for lenses with different diameters.
2. a box with the filter and its leather carrying case.
3. a box with the filter holder.

The adapter rings allow us to put the filter holder on any lens, since we have a large number of different diameters. They are made of black metal and well made. With inscription on each ring of the corresponding diameter.

It is a square filter ND1000 100x100 mm and 2 mm thick. It allows us to remove 10 light levels to make long exposures in daylight perfect. In the example photo I posted, it is taken at noon at 30 ". I love the play that can be taken from this filter.

The filter comes in a leather case and is covered with tissue paper. The case is sturdy enough to protect it properly.
The glass is not easily marked by fingers and does not attract dust.

The filter holder is metallic, with the part where the filters rest being made of some kind of very hard plastic. They easily fit two 100x100 filters

High quality! Great value for money! I will 100% Recommend this product! Fast delivery!

Once assembled, it works flawlessly For the price, more than okay, but assembly a bit fiddly

I loved the quality of the materials, all metallic. I looked at many kits but they were all plastic and this one in particular caught my attention from the comments. The truth is that it was a success because any other similar kit does not fall below 300€.The nd1000 optical filter is made of glass and gives a very good quality. The only thing I noticed is that it loses a bit of saturation and the white balance is a little bluish, but when processing the RAW it's easily remedied. You increase the color temperature and saturation and you're done!! (I use a Canon 80d + 16-35 f4's). I imagine each optic will be different. Attached some photos so you can see the difference with filter and without filter. Exposure time on the photo with the 30" filter. If you want to start in the world of filters, for this price don't even think about it. Excellent results.

Came really well packaged and a great value. Filter seems good, no noticeable hues, adapter rings for most size lenses and the metal holder seem durable

I bought this filter set for landscape photography.

Before that, I had been traveling with a screw set from another company. I was then able to screw that onto exactly 1 lens. (I got it for a 24-105).

Experience has shown that screw filters can only be used in part (in my opinion).
If you use an ND 8x filter, you can safely screw it onto the lens and work with it. However, as soon as it gets higher, the camera is overwhelmed. Setting a focus manually, for example, is an impossibility, with a permanently installed 1000x filter.

This set allows you to set up the camera in peace. To compose the picture, to set a focus. Adjust the polarizing filter. When everything is done so far, you can relax and add 64x or 1000x and take care of the exposure.

The whole set is incredibly easy to use. Each filter is placed in a frame, which in turn has special handles.

The set comes in a handy bag.

I don't really want to talk about space requirements. The screw set is definitely more compact, but handling is simply more important to me at this point.
This kit allows me to mount the filters without leaving grease finger marks on the filter. That's worth more to me at this point.

What I particularly like about this concept is the fact that you can now buy graduated filters and the like at a later date and adapt the set as you like it.