The first end mill didn't even go .125" into the cut of the 1018 CRS before it overheated and melted the tips on the ends. Blue about .200 until the ridges and corners GONE!. Don't waste your money or time on it. Not even worth my time to put in a return request. 0 stars across the board because I can't rate less than zero and Revain wouldn't let me rate me less than one star.