Review on Disston E0102330 16 Inch Blu Mol Sheet by Carlos Deuschle

I bought it for a special sleeve so it's rarely used. Worked great for 3 or 4 holes then the pilot bit broke loose and fell out. There is no set screw holding the drill, it appears it was simply pushed in. I have a set of Dewalt sheet metal hole saws with a pilot drill set screw that I have used regularly and have never had a problem.