I don't often drill holes this size. And I drill them into metal even less often. And rare stainless steel. So I ordered the cheapest solution I could find. I looked at what is offered in the port tool. Then I turned to Revane. These bits were designed for metal and were inexpensive. I'd be happy if the 1" drill bit I use could only cut one hole: stainless steel is notorious for dull bits. require repeated operations Remember to use cutting fluid.