It fits so securely that at first I thought it might be magnetic, but it's not. The stainless steel metal is beautiful, polished and of high quality. It is quite heavy, as it should be. It's smooth on all edges, and obviously very well made. I find it helpful when using my new WDT tool as the higher sides prevent the coffee grounds from falling out. I've been making espresso at home for 19 years, and only just found out about these funnels. I think they are very useful and worth the money.