Very pleased with the K&F Concept 18Pcs Metal Stepping Adpater Rings Set. Both the step-up and step-down rings fit the lenses I which required them. No issues adding a lense or removing it. No issues attching/removing the rings to the camera either. The set of 18, 9 upand 9 down, cover pretty much every situation in which you may need to use this product. I have a 58mm threaqd on my camera and 77mm was the smallest some of the lenses I am using. I also have a few 52mm that would otherwise would have had to be replaced. Definitely a cost effective way to get the most out of what you have.

Given the price of some individual step up/down rings, this is a really affordable way to ensure you've always got what you need onhand. The quality seems to be relatively good. There's no rough endges, no tinny ring or scraping sounds when using them. They stay in place as well. I have had no issues thus far.

Both sets came in a their own plastic pouch and both pouches were in a larger bag. There was no box or abything like that. It would have been a little easier to store them had they arrived in better packaging or
acase of some sort. Minor detail that really doesn't impact performance.