The blade is made from Aldo's 1084, but I'm not using the draw file method. The piece that caused all the problems with the drill was cut from another piece of 1084 (the thicker piece). Not sure what the difference between the two is, or whether I was work hardening the piece with my drilling. The blade is much easier to work than the guard. Even after all that effort, I'm still contemplating starting over with the guard.