I purchased this so I could use my Cokin filters on my 10mm-20mm wide angle lens, to say I was disappointed was an understatement. Firstly it looks very similar to the genuine Cokin wide-angle slim filter holder but it doesn't fit on the Cokin adaptor ring, the slot is way too thin as is the slot for the circular polarizer, the genuine Cokin one will not fit at all. My Cokin filters did fit but it was a very tight fit and sliding my graduated filters up and down was virtually impossible. Secondly the materials used in construction are far inferior to the genuine item especially the lugs that are designed to hold it on to the adaptor ring, these are made from such a thin and flimsy plastic that they are almost broken already after very minimal use. I realise this item is half the price of the genuine Cokin item but it is a false economy, this item is just not fit for purpose. I have ended up having to buy the genuine Cokin item and the difference between the two is very noticeable.