This is a nice quality drill bit. I've been using it in aluminum, plastic, and steel sheet. The 120 degree flats on the shank make it really nice so that it doesn't slip in the drill chuck. Remember when drilling to slow your rpm considerably as you go to larger dia steps, especially drilling steel and aluminum. The titanium nitride coating will help prevent wear and gives longer tool life, but you still need to resist the temptation of running a large diameter drill really fast.