I tried to drill a hole in a stainless steel sink with a titanium drill bit I already have and failed miserably. It just made a small dent on it and nothing else. I did some research and it was recommended so I gave it a try. I took the advice of one of the reviewers, used olive oil and drilled at low speed. I was able to drill and make a 1/2 inch diameter hole in my stainless steel sink in minutes. I almost gave up and it was my last hope. I'm so glad I decided to try it. I'll probably buy a set of drill bits too.