This is a pop-up drain strainer for a washbasin. If the diameter matches, you can easily install it by removing the old one and inserting this one. I purchased one with a 30mm diameter for my house, but as you can see in the photo, the tip was 30mm, but the base was 33mm, so I couldn't install it. Therefore, I haven't used it, but I thought I could install it, so I threw away the box and tried to install the tip. I will write down the dimensions so that you don't make the same mistake, so please check if you can install it. If you can install it, cleaning is easy and it's convenient because it pops up with one touch. Photo 1: Overall photo of the main body. Photo 2: It will be sent with the scratch-prevention cover on. Photo 3 to Photo 4: Pop-up state (one touch). Photo 5: The wide part, this sits on top of the washbasin, so it can be large. Photo 6: The tip is about 30mm. Photo 7: The base is about 33mm + packing. Photo 8: The depth is about 73mm. Photo 9: The strainer part can be removed with one touch for cleaning. Photo 10: There are 2 spare rubber packings. Thank you very much for checking everything. We hope you will purchase it after confirming the above. If you have any questions, please feel free to contact us via message.