Even works with tile!
I normally drill my Prado outlet holes with a 5 axis CNC saw. However, sometimes customers add their outlet locations after the backsplash has been cut on the saw. This makes cutting the holes challenging. I purchased this bit so that we could drill the holes by hand with a grinder and have the counterbore. It works perfectly to do that. I have turned so many builders onto Prado outlets. I have even drilled them into porcelain tiles for customers using this bit.