No masonry drill required. So when I had to drill four holes in my shower tiles I had a set of 10. I have already drilled holes in identical (3/8" hard) tiles using the same tools but different bits (a well known brand). Will be four Holes suffice, right? I knew a lot! I drilled all four holes with a drill bit! And I literally spent fractions of the time with "branded drills." So I threw it away, but who cares? It held up at least four times that way long and worked _much_ faster! Full marks, JOERIC!