After opening the package for the first time, apply double-sided tape to the area on the sink wall. I cleaned it thoroughly and attached it. I thought it was quite firmly attached. So I attached a few things like knives and scissors, and they stuck well. However, the adhesive tape came off in just 10 minutes. Fortunately, there was a nail hole. I'll have to fix it separately with nails or silicone adhesive. I am deducting 2 points from the 5-star rating because the adhesive strength has decreased. I like the magnetism. It sticks well at first, but falls off after 30 minutes. It sheds better in winter. In the end, with silicone adhesive. I did some extra work to finally attach it. Ali products are always like this. Do not expect the adhesive strength of the product; purchase after considering. You must do the adhesive work separately to complete it.