The polarizing filter from K&F Concept is delivered in a plastic box together with a cleaning cloth, a lens cap and a strap for attaching the lens cap. Quite a lot of accessories! It's just a shame that the filter slides back and forth in the box without any additional protection. A few cents for a suitable lining would have been worth it. The filter can be easily screwed onto the lens and - so far - removed just as easily. The rotating ring for adjusting the polarizing filter, on the other hand, is very stiff, which I personally don't like so much. Nevertheless, the workmanship does not give a cheap impression at all. According to the manufacturer, the glass has a nano coating, but in my opinion this can only be sparse. When used, this filter changes the colors more than the filter I normally use in a higher price range. All in all, this filter is a very interesting offer, especially for occasional users. At currently just under € 22 for the 67mm version, the K&F Concept polarizing filter is very cheap and offers quite decent quality. I could do without the lens cap and strap, but of course the accessories are not a disadvantage. I give the polarizing filter four stars.