I measured and trimmed with a chop saw had it in and installed in about an hour, I see people complaining the fiber on the topCatches “It dose” easy remedy was a bit ofWaterproof Aqua defense. There was clear institutions but you could YouTube other products they are virtually the same principle; The only thing I wanted a black drain, I contacted Vevor and they were swift to check but alas Stainless steel drain is all they do. No big deal very good value for money compared to the competition and I am not a builder but found this a very easy product value for money and easy to install